Calcular tempo relativo em C #

Dado um valor específico de DateTime , como exibo o tempo relativo, como:

  • 2 horas atrás
  • 3 dias atrás
  • um mês atrás

Jeff, seu código é legal, mas poderia ser mais claro com constantes (como sugerido no Code Complete).

 const int SECOND = 1; const int MINUTE = 60 * SECOND; const int HOUR = 60 * MINUTE; const int DAY = 24 * HOUR; const int MONTH = 30 * DAY; var ts = new TimeSpan(DateTime.UtcNow.Ticks - yourDate.Ticks); double delta = Math.Abs(ts.TotalSeconds); if (delta < 1 * MINUTE) return ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago"; if (delta < 2 * MINUTE) return "a minute ago"; if (delta < 45 * MINUTE) return ts.Minutes + " minutes ago"; if (delta < 90 * MINUTE) return "an hour ago"; if (delta < 24 * HOUR) return ts.Hours + " hours ago"; if (delta < 48 * HOUR) return "yesterday"; if (delta < 30 * DAY) return ts.Days + " days ago"; if (delta < 12 * MONTH) { int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30)); return months <= 1 ? "one month ago" : months + " months ago"; } else { int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365)); return years <= 1 ? "one year ago" : years + " years ago"; } 

plugin jquery.timeago

Jeff, como o Stack Overflow usa o jQuery extensivamente, recomendo o plugin jquery.timeago .

Benefícios:

  • Evite carimbos de data e hora datados de “1 minuto atrás”, mesmo que a página tenha sido aberta há 10 minutos; O timeago é atualizado automaticamente.
  • Você pode aproveitar ao máximo o cache de páginas e / ou fragments em seus aplicativos da Web, porque os registros de data e hora não são calculados no servidor.
  • Você pode usar microformatos como os garotos legais.

Basta anexá-lo aos seus timestamps no pronto para DOM:

 jQuery(document).ready(function() { jQuery('abbr.timeago').timeago(); }); 

Isso irá transformar todos os elementos abbr com uma class timeago e um timestamp ISO 8601 no título:

 July 17, 2008 

em algo como isto:

 4 months ago 

que produz: 4 meses atrás. Conforme o tempo passa, os timestamps serão atualizados automaticamente.

Disclaimer: Eu escrevi este plugin, então eu sou tendencioso.

Aqui está como eu faço

 var ts = new TimeSpan(DateTime.UtcNow.Ticks - dt.Ticks); double delta = Math.Abs(ts.TotalSeconds); if (delta < 60) { return ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago"; } if (delta < 120) { return "a minute ago"; } if (delta < 2700) // 45 * 60 { return ts.Minutes + " minutes ago"; } if (delta < 5400) // 90 * 60 { return "an hour ago"; } if (delta < 86400) // 24 * 60 * 60 { return ts.Hours + " hours ago"; } if (delta < 172800) // 48 * 60 * 60 { return "yesterday"; } if (delta < 2592000) // 30 * 24 * 60 * 60 { return ts.Days + " days ago"; } if (delta < 31104000) // 12 * 30 * 24 * 60 * 60 { int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30)); return months <= 1 ? "one month ago" : months + " months ago"; } int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365)); return years <= 1 ? "one year ago" : years + " years ago"; 

Sugestões? Comentários? Formas de melhorar este algoritmo?

 public static string RelativeDate(DateTime theDate) { Dictionary thresholds = new Dictionary(); int minute = 60; int hour = 60 * minute; int day = 24 * hour; thresholds.Add(60, "{0} seconds ago"); thresholds.Add(minute * 2, "a minute ago"); thresholds.Add(45 * minute, "{0} minutes ago"); thresholds.Add(120 * minute, "an hour ago"); thresholds.Add(day, "{0} hours ago"); thresholds.Add(day * 2, "yesterday"); thresholds.Add(day * 30, "{0} days ago"); thresholds.Add(day * 365, "{0} months ago"); thresholds.Add(long.MaxValue, "{0} years ago"); long since = (DateTime.Now.Ticks - theDate.Ticks) / 10000000; foreach (long threshold in thresholds.Keys) { if (since < threshold) { TimeSpan t = new TimeSpan((DateTime.Now.Ticks - theDate.Ticks)); return string.Format(thresholds[threshold], (t.Days > 365 ? t.Days / 365 : (t.Days > 0 ? t.Days : (t.Hours > 0 ? t.Hours : (t.Minutes > 0 ? t.Minutes : (t.Seconds > 0 ? t.Seconds : 0))))).ToString()); } } return ""; } 

Eu prefiro esta versão por sua concisão, e capacidade de adicionar novos pontos de escala. Isso poderia ser encapsulado com uma extensão Latest() para o Timespan em vez do longo 1 liner, mas por uma questão de brevidade na postagem, isso servirá. Isso corrige uma hora atrás, 1 hora atrás, fornecendo uma hora até que 2 horas se passaram

Aqui uma reescrita do Jeffs Script for PHP:

 define("SECOND", 1); define("MINUTE", 60 * SECOND); define("HOUR", 60 * MINUTE); define("DAY", 24 * HOUR); define("MONTH", 30 * DAY); function relativeTime($time) { $delta = time() - $time; if ($delta < 1 * MINUTE) { return $delta == 1 ? "one second ago" : $delta . " seconds ago"; } if ($delta < 2 * MINUTE) { return "a minute ago"; } if ($delta < 45 * MINUTE) { return floor($delta / MINUTE) . " minutes ago"; } if ($delta < 90 * MINUTE) { return "an hour ago"; } if ($delta < 24 * HOUR) { return floor($delta / HOUR) . " hours ago"; } if ($delta < 48 * HOUR) { return "yesterday"; } if ($delta < 30 * DAY) { return floor($delta / DAY) . " days ago"; } if ($delta < 12 * MONTH) { $months = floor($delta / DAY / 30); return $months <= 1 ? "one month ago" : $months . " months ago"; } else { $years = floor($delta / DAY / 365); return $years <= 1 ? "one year ago" : $years . " years ago"; } } 
 public static string ToRelativeDate(DateTime input) { TimeSpan oSpan = DateTime.Now.Subtract(input); double TotalMinutes = oSpan.TotalMinutes; string Suffix = " ago"; if (TotalMinutes < 0.0) { TotalMinutes = Math.Abs(TotalMinutes); Suffix = " from now"; } var aValue = new SortedList>(); aValue.Add(0.75, () => "less than a minute"); aValue.Add(1.5, () => "about a minute"); aValue.Add(45, () => string.Format("{0} minutes", Math.Round(TotalMinutes))); aValue.Add(90, () => "about an hour"); aValue.Add(1440, () => string.Format("about {0} hours", Math.Round(Math.Abs(oSpan.TotalHours)))); // 60 * 24 aValue.Add(2880, () => "a day"); // 60 * 48 aValue.Add(43200, () => string.Format("{0} days", Math.Floor(Math.Abs(oSpan.TotalDays)))); // 60 * 24 * 30 aValue.Add(86400, () => "about a month"); // 60 * 24 * 60 aValue.Add(525600, () => string.Format("{0} months", Math.Floor(Math.Abs(oSpan.TotalDays / 30)))); // 60 * 24 * 365 aValue.Add(1051200, () => "about a year"); // 60 * 24 * 365 * 2 aValue.Add(double.MaxValue, () => string.Format("{0} years", Math.Floor(Math.Abs(oSpan.TotalDays / 365)))); return aValue.First(n => TotalMinutes < n.Key).Value.Invoke() + Suffix; } 

http://refactormycode.com/codes/493-twitter-esque-relative-dates

Versão C # 6:

 static readonly SortedList> offsets = new SortedList> { { 0.75, _ => "less than a minute"}, { 1.5, _ => "about a minute"}, { 45, x => $"{x.TotalMinutes:F0} minutes"}, { 90, x => "about an hour"}, { 1440, x => $"about {x.TotalHours:F0} hours"}, { 2880, x => "a day"}, { 43200, x => $"{x.TotalDays:F0} days"}, { 86400, x => "about a month"}, { 525600, x => $"{x.TotalDays / 30:F0} months"}, { 1051200, x => "about a year"}, { double.MaxValue, x => $"{x.TotalDays / 365:F0} years"} }; public static string ToRelativeDate(this DateTime input) { TimeSpan x = DateTime.Now - input; string Suffix = x.TotalMinutes > 0 ? " ago" : " from now"; x = new TimeSpan(Math.Abs(x.Ticks)); return offsets.First(n => x.TotalMinutes < n.Key).Value(x) + Suffix; } 

Aqui está uma implementação que eu adicionei como um método de extensão para a class DateTime que lida com datas futuras e passadas e fornece uma opção de aproximação que permite especificar o nível de detalhe que você está procurando (“3 horas atrás” vs “3 horas, 23 minutos, 12 segundos atrás “):

 using System.Text; ///  /// Compares a supplied date to the current date and generates a friendly English /// comparison ("5 days ago", "5 days from now") ///  /// The date to convert /// When off, calculate timespan down to the second. /// When on, approximate to the largest round unit of time. ///  public static string ToRelativeDateString(this DateTime value, bool approximate) { StringBuilder sb = new StringBuilder(); string suffix = (value > DateTime.Now) ? " from now" : " ago"; TimeSpan timeSpan = new TimeSpan(Math.Abs(DateTime.Now.Subtract(value).Ticks)); if (timeSpan.Days > 0) { sb.AppendFormat("{0} {1}", timeSpan.Days, (timeSpan.Days > 1) ? "days" : "day"); if (approximate) return sb.ToString() + suffix; } if (timeSpan.Hours > 0) { sb.AppendFormat("{0}{1} {2}", (sb.Length > 0) ? ", " : string.Empty, timeSpan.Hours, (timeSpan.Hours > 1) ? "hours" : "hour"); if (approximate) return sb.ToString() + suffix; } if (timeSpan.Minutes > 0) { sb.AppendFormat("{0}{1} {2}", (sb.Length > 0) ? ", " : string.Empty, timeSpan.Minutes, (timeSpan.Minutes > 1) ? "minutes" : "minute"); if (approximate) return sb.ToString() + suffix; } if (timeSpan.Seconds > 0) { sb.AppendFormat("{0}{1} {2}", (sb.Length > 0) ? ", " : string.Empty, timeSpan.Seconds, (timeSpan.Seconds > 1) ? "seconds" : "second"); if (approximate) return sb.ToString() + suffix; } if (sb.Length == 0) return "right now"; sb.Append(suffix); return sb.ToString(); } 

Eu recomendaria computar isso no lado do cliente também. Menos trabalho para o servidor.

O seguinte é a versão que eu uso (de Zach Leatherman)

 /* * Javascript Humane Dates * Copyright (c) 2008 Dean Landolt (deanlandolt.com) * Re-write by Zach Leatherman (zachleat.com) * * Adopted from the John Resig's pretty.js * at http://ejohn.org/blog/javascript-pretty-date * and henrah's proposed modification * at http://ejohn.org/blog/javascript-pretty-date/#comment-297458 * * Licensed under the MIT license. */ function humane_date(date_str){ var time_formats = [ [60, 'just now'], [90, '1 minute'], // 60*1.5 [3600, 'minutes', 60], // 60*60, 60 [5400, '1 hour'], // 60*60*1.5 [86400, 'hours', 3600], // 60*60*24, 60*60 [129600, '1 day'], // 60*60*24*1.5 [604800, 'days', 86400], // 60*60*24*7, 60*60*24 [907200, '1 week'], // 60*60*24*7*1.5 [2628000, 'weeks', 604800], // 60*60*24*(365/12), 60*60*24*7 [3942000, '1 month'], // 60*60*24*(365/12)*1.5 [31536000, 'months', 2628000], // 60*60*24*365, 60*60*24*(365/12) [47304000, '1 year'], // 60*60*24*365*1.5 [3153600000, 'years', 31536000], // 60*60*24*365*100, 60*60*24*365 [4730400000, '1 century'] // 60*60*24*365*100*1.5 ]; var time = ('' + date_str).replace(/-/g,"/").replace(/[TZ]/g," "), dt = new Date, seconds = ((dt - new Date(time) + (dt.getTimezoneOffset() * 60000)) / 1000), token = ' ago', i = 0, format; if (seconds < 0) { seconds = Math.abs(seconds); token = ''; } while (format = time_formats[i++]) { if (seconds < format[0]) { if (format.length == 2) { return format[1] + (i > 1 ? token : ''); // Conditional so we don't return Just Now Ago } else { return Math.round(seconds / format[2]) + ' ' + format[1] + (i > 1 ? token : ''); } } } // overflow for centuries if(seconds > 4730400000) return Math.round(seconds / 4730400000) + ' centuries' + token; return date_str; }; if(typeof jQuery != 'undefined') { jQuery.fn.humane_dates = function(){ return this.each(function(){ var date = humane_date(this.title); if(date && jQuery(this).text() != date) // don't modify the dom if we don't have to jQuery(this).text(date); }); }; } 

@jeff

IMHO seu parece um pouco longo. No entanto, parece um pouco mais robusto com suporte para “ontem” e “anos”. Mas na minha experiência, quando isso é usado, é mais provável que a pessoa veja o conteúdo nos primeiros 30 dias. São apenas as pessoas realmente hardcore que vêm depois disso. Então é por isso que eu geralmente escolho manter isso curto e simples.

Este é o método que estou usando atualmente em um dos meus sites. Isso só retorna um dia, hora e hora relativos. E, em seguida, o usuário tem que bater em “ago” na saída.

 public static string ToLongString(this TimeSpan time) { string output = String.Empty; if (time.Days > 0) output += time.Days + " days "; if ((time.Days == 0 || time.Days == 1) && time.Hours > 0) output += time.Hours + " hr "; if (time.Days == 0 && time.Minutes > 0) output += time.Minutes + " min "; if (output.Length == 0) output += time.Seconds + " sec"; return output.Trim(); } 

Há também um pacote chamado Humanizer on Nuget e ele realmente funciona muito bem

 DateTime.UtcNow.AddHours(-30).Humanize() => "yesterday" DateTime.UtcNow.AddHours(-2).Humanize() => "2 hours ago" DateTime.UtcNow.AddHours(30).Humanize() => "tomorrow" DateTime.UtcNow.AddHours(2).Humanize() => "2 hours from now" TimeSpan.FromMilliseconds(1299630020).Humanize() => "2 weeks" TimeSpan.FromMilliseconds(1299630020).Humanize(3) => "2 weeks, 1 day, 1 hour" 

Scott Hanselman escreveu um comentário no blog dele

Alguns anos atrasado para a festa, mas eu tinha a obrigação de fazer isso para datas passadas e futuras, então combinei Jeff e Vincent para isso. É uma extravagância ternária! 🙂

 public static class DateTimeHelper { private const int SECOND = 1; private const int MINUTE = 60 * SECOND; private const int HOUR = 60 * MINUTE; private const int DAY = 24 * HOUR; private const int MONTH = 30 * DAY; ///  /// Returns a friendly version of the provided DateTime, relative to now. Eg: "2 days ago", or "in 6 months". ///  /// The DateTime to compare to Now /// A friendly string public static string GetFriendlyRelativeTime(DateTime dateTime) { if (DateTime.UtcNow.Ticks == dateTime.Ticks) { return "Right now!"; } bool isFuture = (DateTime.UtcNow.Ticks < dateTime.Ticks); var ts = DateTime.UtcNow.Ticks < dateTime.Ticks ? new TimeSpan(dateTime.Ticks - DateTime.UtcNow.Ticks) : new TimeSpan(DateTime.UtcNow.Ticks - dateTime.Ticks); double delta = ts.TotalSeconds; if (delta < 1 * MINUTE) { return isFuture ? "in " + (ts.Seconds == 1 ? "one second" : ts.Seconds + " seconds") : ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago"; } if (delta < 2 * MINUTE) { return isFuture ? "in a minute" : "a minute ago"; } if (delta < 45 * MINUTE) { return isFuture ? "in " + ts.Minutes + " minutes" : ts.Minutes + " minutes ago"; } if (delta < 90 * MINUTE) { return isFuture ? "in an hour" : "an hour ago"; } if (delta < 24 * HOUR) { return isFuture ? "in " + ts.Hours + " hours" : ts.Hours + " hours ago"; } if (delta < 48 * HOUR) { return isFuture ? "tomorrow" : "yesterday"; } if (delta < 30 * DAY) { return isFuture ? "in " + ts.Days + " days" : ts.Days + " days ago"; } if (delta < 12 * MONTH) { int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30)); return isFuture ? "in " + (months <= 1 ? "one month" : months + " months") : months <= 1 ? "one month ago" : months + " months ago"; } else { int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365)); return isFuture ? "in " + (years <= 1 ? "one year" : years + " years") : years <= 1 ? "one year ago" : years + " years ago"; } } } 

Existe uma maneira fácil de fazer isso em Java? A class java.util.Date parece bastante limitada.

Aqui está a minha solução Java rápida e suja:

 import java.util.Date; import javax.management.timer.Timer; String getRelativeDate(Date date) { long delta = new Date().getTime() - date.getTime(); if (delta < 1L * Timer.ONE_MINUTE) { return toSeconds(delta) == 1 ? "one second ago" : toSeconds(delta) + " seconds ago"; } if (delta < 2L * Timer.ONE_MINUTE) { return "a minute ago"; } if (delta < 45L * Timer.ONE_MINUTE) { return toMinutes(delta) + " minutes ago"; } if (delta < 90L * Timer.ONE_MINUTE) { return "an hour ago"; } if (delta < 24L * Timer.ONE_HOUR) { return toHours(delta) + " hours ago"; } if (delta < 48L * Timer.ONE_HOUR) { return "yesterday"; } if (delta < 30L * Timer.ONE_DAY) { return toDays(delta) + " days ago"; } if (delta < 12L * 4L * Timer.ONE_WEEK) { // a month long months = toMonths(delta); return months <= 1 ? "one month ago" : months + " months ago"; } else { long years = toYears(delta); return years <= 1 ? "one year ago" : years + " years ago"; } } private long toSeconds(long date) { return date / 1000L; } private long toMinutes(long date) { return toSeconds(date) / 60L; } private long toHours(long date) { return toMinutes(date) / 60L; } private long toDays(long date) { return toHours(date) / 24L; } private long toMonths(long date) { return toDays(date) / 30L; } private long toYears(long date) { return toMonths(date) / 365L; } 

iPhone obj-c versão

 + (NSString *)timeAgoString:(NSDate *)date { int delta = -(int)[date timeIntervalSinceNow]; if (delta < 60) { return delta == 1 ? @"one second ago" : [NSString stringWithFormat:@"%i seconds ago", delta]; } if (delta < 120) { return @"a minute ago"; } if (delta < 2700) { return [NSString stringWithFormat:@"%i minutes ago", delta/60]; } if (delta < 5400) { return @"an hour ago"; } if (delta < 24 * 3600) { return [NSString stringWithFormat:@"%i hours ago", delta/3600]; } if (delta < 48 * 3600) { return @"yesterday"; } if (delta < 30 * 24 * 3600) { return [NSString stringWithFormat:@"%i days ago", delta/(24*3600)]; } if (delta < 12 * 30 * 24 * 3600) { int months = delta/(30*24*3600); return months <= 1 ? @"one month ago" : [NSString stringWithFormat:@"%i months ago", months]; } else { int years = delta/(12*30*24*3600); return years <= 1 ? @"one year ago" : [NSString stringWithFormat:@"%i years ago", years]; } 

}

No PHP, eu faço assim:

 < ?php function timesince($original) { // array of time period chunks $chunks = array( array(60 * 60 * 24 * 365 , 'year'), array(60 * 60 * 24 * 30 , 'month'), array(60 * 60 * 24 * 7, 'week'), array(60 * 60 * 24 , 'day'), array(60 * 60 , 'hour'), array(60 , 'minute'), ); $today = time(); /* Current unix time */ $since = $today - $original; if($since > 604800) { $print = date("M jS", $original); if($since > 31536000) { $print .= ", " . date("Y", $original); } return $print; } // $j saves performing the count function each time around the loop for ($i = 0, $j = count($chunks); $i < $j; $i++) { $seconds = $chunks[$i][0]; $name = $chunks[$i][1]; // finding the biggest chunk (if the chunk fits, break) if (($count = floor($since / $seconds)) != 0) { break; } } $print = ($count == 1) ? '1 '.$name : "$count {$name}s"; return $print . " ago"; } ?> 

Dado que o mundo e seu marido parecem estar postando exemplos de código, aqui está o que eu escrevi um tempo atrás, baseado em algumas dessas respostas.

Eu tinha uma necessidade específica de que esse código fosse localizável. Então eu tenho duas classs – Grammar , que especifica os termos localisable, e FuzzyDateExtensions , que contém um monte de methods de extensão. Eu não tive necessidade de lidar com datas futuras, então nenhuma tentativa foi feita para lidar com elas com este código.

Deixei alguns dos XMLdoc na fonte, mas removi a maioria (onde eles seriam óbvios) por questão de brevidade. Eu também não incluí todos os alunos aqui:

 public class Grammar { ///  Gets or sets the term for "just now".  public string JustNow { get; set; } ///  Gets or sets the term for "X minutes ago".  ///  /// This is a  pattern, where {0} /// is the number of minutes. ///  public string MinutesAgo { get; set; } public string OneHourAgo { get; set; } public string HoursAgo { get; set; } public string Yesterday { get; set; } public string DaysAgo { get; set; } public string LastMonth { get; set; } public string MonthsAgo { get; set; } public string LastYear { get; set; } public string YearsAgo { get; set; } ///  Gets or sets the term for "ages ago".  public string AgesAgo { get; set; } ///  /// Gets or sets the threshold beyond which the fuzzy date should be /// considered "ages ago". ///  public TimeSpan AgesAgoThreshold { get; set; } ///  /// Initialises a new  instance with the /// specified properties. ///  private void Initialise(string justNow, string minutesAgo, string oneHourAgo, string hoursAgo, string yesterday, string daysAgo, string lastMonth, string monthsAgo, string lastYear, string yearsAgo, string agesAgo, TimeSpan agesAgoThreshold) { ... } } 

A class FuzzyDateString contém:

 public static class FuzzyDateExtensions { public static string ToFuzzyDateString(this TimeSpan timespan) { return timespan.ToFuzzyDateString(new Grammar()); } public static string ToFuzzyDateString(this TimeSpan timespan, Grammar grammar) { return GetFuzzyDateString(timespan, grammar); } public static string ToFuzzyDateString(this DateTime datetime) { return (DateTime.Now - datetime).ToFuzzyDateString(); } public static string ToFuzzyDateString(this DateTime datetime, Grammar grammar) { return (DateTime.Now - datetime).ToFuzzyDateString(grammar); } private static string GetFuzzyDateString(TimeSpan timespan, Grammar grammar) { timespan = timespan.Duration(); if (timespan >= grammar.AgesAgoThreshold) { return grammar.AgesAgo; } if (timespan < new TimeSpan(0, 2, 0)) // 2 minutes { return grammar.JustNow; } if (timespan < new TimeSpan(1, 0, 0)) // 1 hour { return String.Format(grammar.MinutesAgo, timespan.Minutes); } if (timespan < new TimeSpan(1, 55, 0)) // 1 hour 55 minutes { return grammar.OneHourAgo; } if (timespan < new TimeSpan(12, 0, 0) // 12 hours && (DateTime.Now - timespan).IsToday()) { return String.Format(grammar.HoursAgo, timespan.RoundedHours()); } if ((DateTime.Now.AddDays(1) - timespan).IsToday()) { return grammar.Yesterday; } if (timespan < new TimeSpan(32, 0, 0, 0) // 32 days && (DateTime.Now - timespan).IsThisMonth()) { return String.Format(grammar.DaysAgo, timespan.RoundedDays()); } if ((DateTime.Now.AddMonths(1) - timespan).IsThisMonth()) { return grammar.LastMonth; } if (timespan < new TimeSpan(365, 0, 0, 0, 0) // 365 days && (DateTime.Now - timespan).IsThisYear()) { return String.Format(grammar.MonthsAgo, timespan.RoundedMonths()); } if ((DateTime.Now - timespan).AddYears(1).IsThisYear()) { return grammar.LastYear; } return String.Format(grammar.YearsAgo, timespan.RoundedYears()); } } 

Uma das principais coisas que eu queria alcançar, assim como a localização, era que "hoje" significaria apenas "este dia de calendar", portanto, os IsToday , IsThisMonth e IsThisYear são assim:

 public static bool IsToday(this DateTime date) { return date.DayOfYear == DateTime.Now.DayOfYear && date.IsThisYear(); } 

e os methods de arredondamento são assim (eu incluí RoundedMonths , como isso é um pouco diferente):

 public static int RoundedDays(this TimeSpan timespan) { return (timespan.Hours > 12) ? timespan.Days + 1 : timespan.Days; } public static int RoundedMonths(this TimeSpan timespan) { DateTime then = DateTime.Now - timespan; // Number of partial months elapsed since 1 Jan, AD 1 (DateTime.MinValue) int nowMonthYears = DateTime.Now.Year * 12 + DateTime.Now.Month; int thenMonthYears = then.Year * 12 + then.Month; return nowMonthYears - thenMonthYears; } 

Espero que as pessoas achem isto útil e / ou interessante: o)

usando o Fluent DateTime

 var dateTime1 = 2.Hours().Ago(); var dateTime2 = 3.Days().Ago(); var dateTime3 = 1.Months().Ago(); var dateTime4 = 5.Hours().FromNow(); var dateTime5 = 2.Weeks().FromNow(); var dateTime6 = 40.Seconds().FromNow(); 

I thought I’d give this a shot using classs and polymorphism. I had a previous iteration which used sub-classing which ended up having way too much overhead. I’ve switched to a more flexible delegate / public property object model which is significantly better. My code is very slightly more accurate, I wish I could come up with a better way to generate “months ago” that didn’t seem too over-engineered.

I think I’d still stick with Jeff’s if-then cascade because it’s less code and it’s simpler (it’s definitely easier to ensure it’ll work as expected).

For the below code PrintRelativeTime.GetRelativeTimeMessage(TimeSpan ago) returns the relative time message (eg “yesterday”).

 public class RelativeTimeRange : IComparable { public TimeSpan UpperBound { get; set; } public delegate string RelativeTimeTextDelegate(TimeSpan timeDelta); public RelativeTimeTextDelegate MessageCreator { get; set; } public int CompareTo(object obj) { if (!(obj is RelativeTimeRange)) { return 1; } // note that this sorts in reverse order to the way you'd expect, // this saves having to reverse a list later return (obj as RelativeTimeRange).UpperBound.CompareTo(UpperBound); } } public class PrintRelativeTime { private static List timeRanges; static PrintRelativeTime() { timeRanges = new List{ new RelativeTimeRange { UpperBound = TimeSpan.FromSeconds(1), MessageCreator = (delta) => { return "one second ago"; } }, new RelativeTimeRange { UpperBound = TimeSpan.FromSeconds(60), MessageCreator = (delta) => { return delta.Seconds + " seconds ago"; } }, new RelativeTimeRange { UpperBound = TimeSpan.FromMinutes(2), MessageCreator = (delta) => { return "one minute ago"; } }, new RelativeTimeRange { UpperBound = TimeSpan.FromMinutes(60), MessageCreator = (delta) => { return delta.Minutes + " minutes ago"; } }, new RelativeTimeRange { UpperBound = TimeSpan.FromHours(2), MessageCreator = (delta) => { return "one hour ago"; } }, new RelativeTimeRange { UpperBound = TimeSpan.FromHours(24), MessageCreator = (delta) => { return delta.Hours + " hours ago"; } }, new RelativeTimeRange { UpperBound = TimeSpan.FromDays(2), MessageCreator = (delta) => { return "yesterday"; } }, new RelativeTimeRange { UpperBound = DateTime.Now.Subtract(DateTime.Now.AddMonths(-1)), MessageCreator = (delta) => { return delta.Days + " days ago"; } }, new RelativeTimeRange { UpperBound = DateTime.Now.Subtract(DateTime.Now.AddMonths(-2)), MessageCreator = (delta) => { return "one month ago"; } }, new RelativeTimeRange { UpperBound = DateTime.Now.Subtract(DateTime.Now.AddYears(-1)), MessageCreator = (delta) => { return (int)Math.Floor(delta.TotalDays / 30) + " months ago"; } }, new RelativeTimeRange { UpperBound = DateTime.Now.Subtract(DateTime.Now.AddYears(-2)), MessageCreator = (delta) => { return "one year ago"; } }, new RelativeTimeRange { UpperBound = TimeSpan.MaxValue, MessageCreator = (delta) => { return (int)Math.Floor(delta.TotalDays / 365.24D) + " years ago"; } } }; timeRanges.Sort(); } public static string GetRelativeTimeMessage(TimeSpan ago) { RelativeTimeRange postRelativeDateRange = timeRanges[0]; foreach (var timeRange in timeRanges) { if (ago.CompareTo(timeRange.UpperBound) < = 0) { postRelativeDateRange = timeRange; } } return postRelativeDateRange.MessageCreator(ago); } } 

When you know the viewer’s time zone, it might be clearer to use calendar days at the day scale. I’m not familiar with the .NET libraries so I don’t know how you’d do that in C#, unfortunately.

On consumer sites, you could also be hand-wavier under a minute. “Less than a minute ago” or “just now” could be good enough.

 using System; using System.Collections.Generic; using System.Linq; public static class RelativeDateHelper { private static Dictionary> sm_Dict = null; private static Dictionary> DictionarySetup() { var dict = new Dictionary>(); dict.Add(0.75, (mins) => "less than a minute"); dict.Add(1.5, (mins) => "about a minute"); dict.Add(45, (mins) => string.Format("{0} minutes", Math.Round(mins))); dict.Add(90, (mins) => "about an hour"); dict.Add(1440, (mins) => string.Format("about {0} hours", Math.Round(Math.Abs(mins / 60)))); // 60 * 24 dict.Add(2880, (mins) => "a day"); // 60 * 48 dict.Add(43200, (mins) => string.Format("{0} days", Math.Floor(Math.Abs(mins / 1440)))); // 60 * 24 * 30 dict.Add(86400, (mins) => "about a month"); // 60 * 24 * 60 dict.Add(525600, (mins) => string.Format("{0} months", Math.Floor(Math.Abs(mins / 43200)))); // 60 * 24 * 365 dict.Add(1051200, (mins) => "about a year"); // 60 * 24 * 365 * 2 dict.Add(double.MaxValue, (mins) => string.Format("{0} years", Math.Floor(Math.Abs(mins / 525600)))); return dict; } public static string ToRelativeDate(this DateTime input) { TimeSpan oSpan = DateTime.Now.Subtract(input); double TotalMinutes = oSpan.TotalMinutes; string Suffix = " ago"; if (TotalMinutes < 0.0) { TotalMinutes = Math.Abs(TotalMinutes); Suffix = " from now"; } if (null == sm_Dict) sm_Dict = DictionarySetup(); return sm_Dict.First(n => TotalMinutes < n.Key).Value.Invoke(TotalMinutes) + Suffix; } } 

The same as another answer to this question but as an extension method with a static dictionary.

you can try this.I think it will work correctly.

 long delta = new Date().getTime() - date.getTime(); const int SECOND = 1; const int MINUTE = 60 * SECOND; const int HOUR = 60 * MINUTE; const int DAY = 24 * HOUR; const int MONTH = 30 * DAY; if (delta < 0L) { return "not yet"; } if (delta < 1L * MINUTE) { return ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago"; } if (delta < 2L * MINUTE) { return "a minute ago"; } if (delta < 45L * MINUTE) { return ts.Minutes + " minutes ago"; } if (delta < 90L * MINUTE) { return "an hour ago"; } if (delta < 24L * HOUR) { return ts.Hours + " hours ago"; } if (delta < 48L * HOUR) { return "yesterday"; } if (delta < 30L * DAY) { return ts.Days + " days ago"; } if (delta < 12L * MONTH) { int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30)); return months <= 1 ? "one month ago" : months + " months ago"; } else { int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365)); return years <= 1 ? "one year ago" : years + " years ago"; } 

Java for client-side gwt usage:

 import java.util.Date; public class RelativeDateFormat { private static final long ONE_MINUTE = 60000L; private static final long ONE_HOUR = 3600000L; private static final long ONE_DAY = 86400000L; private static final long ONE_WEEK = 604800000L; public static String format(Date date) { long delta = new Date().getTime() - date.getTime(); if (delta < 1L * ONE_MINUTE) { return toSeconds(delta) == 1 ? "one second ago" : toSeconds(delta) + " seconds ago"; } if (delta < 2L * ONE_MINUTE) { return "one minute ago"; } if (delta < 45L * ONE_MINUTE) { return toMinutes(delta) + " minutes ago"; } if (delta < 90L * ONE_MINUTE) { return "one hour ago"; } if (delta < 24L * ONE_HOUR) { return toHours(delta) + " hours ago"; } if (delta < 48L * ONE_HOUR) { return "yesterday"; } if (delta < 30L * ONE_DAY) { return toDays(delta) + " days ago"; } if (delta < 12L * 4L * ONE_WEEK) { long months = toMonths(delta); return months <= 1 ? "one month ago" : months + " months ago"; } else { long years = toYears(delta); return years <= 1 ? "one year ago" : years + " years ago"; } } private static long toSeconds(long date) { return date / 1000L; } private static long toMinutes(long date) { return toSeconds(date) / 60L; } private static long toHours(long date) { return toMinutes(date) / 60L; } private static long toDays(long date) { return toHours(date) / 24L; } private static long toMonths(long date) { return toDays(date) / 30L; } private static long toYears(long date) { return toMonths(date) / 365L; } } 

@Jeff

var ts = new TimeSpan(DateTime.UtcNow.Ticks – dt.Ticks);

Doing a subtraction on DateTime returns a TimeSpan anyway.

So you can just do

 (DateTime.UtcNow - dt).TotalSeconds 

I’m also surprised to see the constants multiplied-out by hand and then comments added with the multiplications in. Was that some misguided optimisation?

You can reduce the server-side load by performing this logic client-side. View source on some Digg pages for reference. They have the server emit an epoch time value that gets processed by Javascript. This way you don’t need to manage the end user’s time zone. The new server-side code would be something like:

 public string GetRelativeTime(DateTime timeStamp) { return string.Format("", timeStamp.ToFileTimeUtc()); } 

You could even add a NOSCRIPT block there and just perform a ToString().

Here’s the algorithm stackoverflow uses but rewritten more concisely in perlish pseudocode with a bug fix (no “one hours ago”). The function takes a (positive) number of seconds ago and returns a human-friendly string like “3 hours ago” or “yesterday”.

 agoify($delta) local($y, $mo, $d, $h, $m, $s); $s = floor($delta); if($s< =1) return "a second ago"; if($s<60) return "$s seconds ago"; $m = floor($s/60); if($m==1) return "a minute ago"; if($m<45) return "$m minutes ago"; $h = floor($m/60); if($h==1) return "an hour ago"; if($h<24) return "$h hours ago"; $d = floor($h/24); if($d<2) return "yesterday"; if($d<30) return "$d days ago"; $mo = floor($d/30); if($mo<=1) return "a month ago"; $y = floor($mo/12); if($y<1) return "$mo months ago"; if($y==1) return "a year ago"; return "$y years ago"; 

You can use TimeAgo extension from which looks like the following:

 public static string TimeAgo(this DateTime dateTime) { string result = string.Empty; var timeSpan = DateTime.Now.Subtract(dateTime); if (timeSpan < = TimeSpan.FromSeconds(60)) { result = string.Format("{0} seconds ago", timeSpan.Seconds); } else if (timeSpan <= TimeSpan.FromMinutes(60)) { result = timeSpan.Minutes > 1 ? String.Format("about {0} minutes ago", timeSpan.Minutes) : "about a minute ago"; } else if (timeSpan < = TimeSpan.FromHours(24)) { result = timeSpan.Hours > 1 ? String.Format("about {0} hours ago", timeSpan.Hours) : "about an hour ago"; } else if (timeSpan < = TimeSpan.FromDays(30)) { result = timeSpan.Days > 1 ? String.Format("about {0} days ago", timeSpan.Days) : "yesterday"; } else if (timeSpan < = TimeSpan.FromDays(365)) { result = timeSpan.Days > 30 ? String.Format("about {0} months ago", timeSpan.Days / 30) : "about a month ago"; } else { result = timeSpan.Days > 365 ? String.Format("about {0} years ago", timeSpan.Days / 365) : "about a year ago"; } return result; } 

Or use jQuery plugin with Razor extension from Timeago.

This, I got from one of Bill Gates’ blog. I need to find it on my browser history and I’ll give you the link.

The Javascript code to do the same thing (as requested):

 function posted(t) { var now = new Date(); var diff = parseInt((now.getTime() - Date.parse(t)) / 1000); if (diff < 60) { return 'less than a minute ago'; } else if (diff < 120) { return 'about a minute ago'; } else if (diff < (2700)) { return (parseInt(diff / 60)).toString() + ' minutes ago'; } else if (diff < (5400)) { return 'about an hour ago'; } else if (diff < (86400)) { return 'about ' + (parseInt(diff / 3600)).toString() + ' hours ago'; } else if (diff < (172800)) { return '1 day ago'; } else {return (parseInt(diff / 86400)).toString() + ' days ago'; } } 

Basically, you work in terms of seconds...

I think there is already a number of answers related to this post, but one can use this which is easy to use just like plugin and also easily readable for programmers. Send your specific date, and get its value in string form:

 public string RelativeDateTimeCount(DateTime inputDateTime) { string outputDateTime = string.Empty; TimeSpan ts = DateTime.Now - inputDateTime; if (ts.Days > 7) { outputDateTime = inputDateTime.ToString("MMMM d, yyyy"); } else if (ts.Days > 0) { outputDateTime = ts.Days == 1 ? ("about 1 Day ago") : ("about " + ts.Days.ToString() + " Days ago"); } else if (ts.Hours > 0) { outputDateTime = ts.Hours == 1 ? ("an hour ago") : (ts.Hours.ToString() + " hours ago"); } else if (ts.Minutes > 0) { outputDateTime = ts.Minutes == 1 ? ("1 minute ago") : (ts.Minutes.ToString() + " minutes ago"); } else outputDateTime = "few seconds ago"; return outputDateTime; } 
 /** * {@code date1} has to be earlier than {@code date2}. */ public static String relativize(Date date1, Date date2) { assert date2.getTime() >= date1.getTime(); long duration = date2.getTime() - date1.getTime(); long converted; if ((converted = TimeUnit.MILLISECONDS.toDays(duration)) > 0) { return String.format("%d %s ago", converted, converted == 1 ? "day" : "days"); } else if ((converted = TimeUnit.MILLISECONDS.toHours(duration)) > 0) { return String.format("%d %s ago", converted, converted == 1 ? "hour" : "hours"); } else if ((converted = TimeUnit.MILLISECONDS.toMinutes(duration)) > 0) { return String.format("%d %s ago", converted, converted == 1 ? "minute" : "minutes"); } else if ((converted = TimeUnit.MILLISECONDS.toSeconds(duration)) > 0) { return String.format("%d %s ago", converted, converted == 1 ? "second" : "seconds"); } else { return "just now"; } } 

If you want to have an output like “2 days, 4 hours and 12 minutes ago”, you need a timespan:

 TimeSpan timeDiff = DateTime.Now-CreatedDate; 

Then you can access the values you like:

 timeDiff.Days timeDiff.Hours 

etc.

 var ts = new TimeSpan(DateTime.Now.Ticks - dt.Ticks);