模糊数据算法

Question

我正在寻找模糊日期算法。 我刚开始写一个，就意识到这是一项多么乏味的任务。 它很快就退化为许多可怕的代码，以应对特殊情况，例如“昨天”、“上周”和“上个月末”之间的差异，所有这些都可以（在某些情况下）引用同一天，但单独正确基于今天的日期。

我确信一定有一个开源模糊日期格式化程序，但我找不到它。 理想情况下，我想要使用 NSDate (OSX/iPhone) 及其格式化程序的东西，但这并不是困难的一点。 有谁知道模糊日期格式化程序采用相对于现在的任何时间段并返回类似（但不限于）的字符串：

• 几分钟前
• 在最后五分钟
• 前 今天
• 早上
• 昨晚 上周
• 上
• 周三
• 上月初
• 六月去年
• 几年前

在理想的世界中，我希望字符串尽可能丰富（即返回“刚才”的随机变体，例如“刚刚”）。

澄清。 我正在寻找比基本的桶和绳子更微妙的东西。 我想要知道“昨天”和“上周三”都可以指同一时期的东西，但当今天是星期四时，只有一个是正确的。

Answer 1

NSDateFormatter 中有一个属性 - “doesRelativeDateFormatting”。 它仅出现在 10.6/iOS4.0 及更高版本中，但它会将日期格式化为正确区域设置中的相对日期。

来自 Apple 文档：

如果日期格式化程序使用相对日期
格式化，在可能的情况下替换
其输出的日期部分
一个短语——例如“今天”或
“明天”——表示亲戚
日期。 可用的短语取决于
日期格式化程序的区域设置；
而对于未来的日期，
英语可能只允许“明天”，
法国可能允许“
后天”，如图所示
以下示例。

代码

下面的代码将打印出给定区域设置的大量相关字符串。

NSLocale *locale = [NSLocale currentLocale];
//    NSLocale *locale = [[[NSLocale alloc] initWithLocaleIdentifier:@"fr_FR"] autorelease];

NSDateFormatter *relativeDateFormatter = [[NSDateFormatter alloc] init];
[relativeDateFormatter setTimeStyle:NSDateFormatterNoStyle];
[relativeDateFormatter setDateStyle:NSDateFormatterMediumStyle];
[relativeDateFormatter setDoesRelativeDateFormatting:YES];
[relativeDateFormatter setLocale:locale];

NSDateFormatter *normalDateFormatter = [[NSDateFormatter alloc] init];
[normalDateFormatter setTimeStyle:NSDateFormatterNoStyle];
[normalDateFormatter setDateStyle:NSDateFormatterMediumStyle];
[normalDateFormatter setDoesRelativeDateFormatting:NO];
[normalDateFormatter setLocale:locale];

NSString * lastUniqueString = nil;

for ( NSTimeInterval timeInterval = -60*60*24*400; timeInterval < 60*60*24*400; timeInterval += 60.0*60.0*24.0 )
{
    NSDate * date = [NSDate dateWithTimeIntervalSinceNow:timeInterval];

    NSString * relativeFormattedString = [relativeDateFormatter stringForObjectValue:date];
    NSString * formattedString = [normalDateFormatter stringForObjectValue:date];

    if ( [relativeFormattedString isEqualToString:lastUniqueString] || [relativeFormattedString isEqualToString:formattedString] )
        continue;

    NSLog( @"%@", relativeFormattedString );
    lastUniqueString = relativeFormattedString;
}

注意：

• 区域设置不是必需的
• 有
  没有那么多替代品
  英语。 在撰写本文时
  分别是：“昨天、今天、明天”。
  苹果未来可能会包含更多内容。
• 更改语言环境并查看很有趣
  其他语言版本有哪些内容
  （法语比英语多一些，
  例如）
• 如果在 iOS 上，您可能需要订阅 UIApplicationSignificantTimeChangeNotification

Interface Builder

您可以在 Interface Builder 中设置“doesRelativeDateFormatting”属性：

• 选择您的 NSDateFormatter 并
  选择“身份检查器”选项卡
  检查员调色板的（最后一个
  一个 [command-6]）。
• 在名为“用户
  定义的运行时属性”，您可以
  为所选对象上的键添加您自己的值（在本例中为您的 NSDateFormatter 实例）。 添加
  “doesRelativeDateFormatting”，选择
  “布尔”类型，并确保它是
  检查过。
• 记住：它可能看起来根本不起作用，但这可能是因为您的区域设置只有几个替换值。 在决定是否设置正确之前，至少尝试一下昨天、今天和明天的日期。

Answer 2

这个问题应该可以帮助您入门。它包含该网站使用的代码计算其相对时间。 它可能没有您想要的特定范围，但是一旦您设置好它们就很容易添加。

Answer 3

您可能想在 中查看 Rail 的 distance_of_time_in_words 函数date_helper.rb，我已将其粘贴在下面。

# File vendor/rails/actionpack/lib/action_view/helpers/date_helper.rb, line 59
def distance_of_time_in_words(from_time, to_time = 0, include_seconds = false, options = {})
 from_time = from_time.to_time if from_time.respond_to?(:to_time)
 to_time = to_time.to_time if to_time.respond_to?(:to_time)
 distance_in_minutes = (((to_time - from_time).abs)/60).round
 distance_in_seconds = ((to_time - from_time).abs).round

 I18n.with_options :locale => options[:locale], :scope => 'datetime.distance_in_words''datetime.distance_in_words' do |locale|
   case distance_in_minutes
     when 0..1
       return distance_in_minutes == 0 ?
              locale.t(:less_than_x_minutes, :count => 1) :
              locale.t(:x_minutes, :count => distance_in_minutes) unless include_seconds

       case distance_in_seconds
         when 0..4   then locale.t :less_than_x_seconds, :count => 5
         when 5..9   then locale.t :less_than_x_seconds, :count => 10
         when 10..19 then locale.t :less_than_x_seconds, :count => 20
         when 20..39 then locale.t :half_a_minute
         when 40..59 then locale.t :less_than_x_minutes, :count => 1
         else             locale.t :x_minutes,           :count => 1
       end

     when 2..44           then locale.t :x_minutes,      :count => distance_in_minutes
     when 45..89          then locale.t :about_x_hours,  :count => 1
     when 90..1439        then locale.t :about_x_hours,  :count => (distance_in_minutes.to_f / 60.0).round
     when 1440..2879      then locale.t :x_days,         :count => 1
     when 2880..43199     then locale.t :x_days,         :count => (distance_in_minutes / 1440).round
     when 43200..86399    then locale.t :about_x_months, :count => 1
     when 86400..525599   then locale.t :x_months,       :count => (distance_in_minutes / 43200).round
     when 525600..1051199 then locale.t :about_x_years,  :count => 1
     else                      locale.t :over_x_years,   :count => (distance_in_minutes / 525600).round
   end
 end
end

Answer 4

所以，这是我在 NSDate 上为那些仍然感兴趣的人写的类别。 问题是变得有点堂吉诃德式的问题之一。 它基本上是一个巨大的 switch 语句（尽管我在一系列级联 if() 中实现了它，以使其更具可读性。

对于每个时间段，我都会从一组随机的计时方式中进行选择。

总而言之，这让我们的一些用户感到高兴，但我不确定这是否值得付出努力，

NSTimeInterval const kTenSeconds = (10.0f );
NSTimeInterval const kOneMinute = (60.0f);
NSTimeInterval const kFiveMinutes = (5.0f*60.0f);
NSTimeInterval const kFifteenMinutes = (15.0f*60.0f) ;
NSTimeInterval const kHalfAnHour = (30.0f*60.0f) ;
NSTimeInterval const kOneHour = 3600.0f;    // (60.0f * 60.0f);
NSTimeInterval const kHalfADay = (3600.0f * 12.0f);
NSTimeInterval const kOneDay = (3600.0f * 24.0f);
NSTimeInterval const kOneWeek = (3600.0f * 24.0f * 7.0f);

@implementation NSDate (Fuzzy)

-(NSString*)fuzzyStringRelativeToNow;
{
    static NSArray* secondsStrings;
    static NSArray* minuteStrings;
    static NSArray* fiveMinuteStrings;
    static NSArray* halfHourStrings;
    static NSArray* earlyMonthStrings;

    NSTimeInterval timeFromNow = [self timeIntervalSinceNow];
    if((timeFromNow < 0))       // In the past
    {
        timeFromNow = - timeFromNow;

        if ( (timeFromNow <  kTenSeconds))
        {
            if(!secondsStrings)
            {   
                secondsStrings = [[NSArray arrayWithObjects:@"just now",
                                                            //@"a few seconds ago",
                                                            //@"right this instant",
                                                            @"moments ago",
                                                            nil] retain];
            }

            unsigned int index = random() % ([secondsStrings count] - 1);
            return [secondsStrings objectAtIndex:index];
        }

        if ( (timeFromNow < kOneMinute))
        {
            if(!minuteStrings)
            {

                minuteStrings = [[NSArray arrayWithObjects:@"just now",
                                  @"very recently",
                                  @"in the last minute",
                                  nil] retain];
            }

            unsigned int index = random() % ([minuteStrings count] - 1);
            return [minuteStrings objectAtIndex:index];
        }

        if (timeFromNow < kFiveMinutes)
        {
            if(!fiveMinuteStrings)
            {
                fiveMinuteStrings = [[NSArray arrayWithObjects:@"just now",
                                      @"very recently",
                                      //@"in the last minute",
                                      @"a few minutes ago",
                                      //@"in the last five minutes",
                                      nil] retain];
            }
            unsigned int index = random() % ([fiveMinuteStrings count] - 1);
            return [fiveMinuteStrings objectAtIndex:index];
        }

        if (timeFromNow < kFifteenMinutes)
        {
            return @"in the last 15 minutes";
        }

        if (timeFromNow < kHalfAnHour)
        {
            if(!halfHourStrings)
            {
                halfHourStrings = [[NSArray arrayWithObjects:@"in the last half hour",
                                                            //@"in the last half an hour",
                                                            @"in the last 30 minutes",
                                                            //@"about half an hour ago",
                                                            @"fairly recently",
                                                            nil] retain];
            }
            unsigned int index = random() % ([halfHourStrings count] - 1);
            return [halfHourStrings objectAtIndex:index];
        }

        if (timeFromNow < kOneHour)
        {
            return @"in the last hour";
        }

        if ((timeFromNow < (kOneHour + kFiveMinutes)) && (timeFromNow > (kOneHour - kFiveMinutes)))
        {
            return @"about an hour ago";
        }

        if((timeFromNow < ((kOneHour*2.0f) + kFiveMinutes ))&& (timeFromNow > ((kOneHour*2.0f) - kFiveMinutes)))
        {
            return @"a couple of hours ago";
        }

        // Now we're over an hour, we need to calculate a few specific dates to compare against

        NSDate *today = [NSDate date];

        NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];

        NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit;
        NSDateComponents* todayComponents = [gregorian components:unitFlags fromDate:today];

        todayComponents.hour = 12;

        NSDate* noonToday = [gregorian dateFromComponents:todayComponents];


        NSTimeInterval timeSinceNoonToday = [self timeIntervalSinceDate:noonToday];

        if (timeSinceNoonToday > 0)                         // sometime since noon
        {
            if (timeSinceNoonToday > kOneHour * 9)          // i.e. after 9pm today
                return @"earlier tonight";
            if (timeSinceNoonToday > kOneHour * 7)          // i.e. after 7pm today
                return @"earlier this evening";
            if (timeSinceNoonToday < kOneHour * 1)          // between noon and 1pm
                return @"early this afternoon";

            return @"this afternoon";
        }


        NSTimeInterval timeSinceMidnight = kHalfADay -timeSinceNoonToday;   // Note sign is reversed.   

        if ((timeSinceNoonToday < 0) & (timeSinceNoonToday > -kHalfADay))       // between midnight and noon today
        {
            if (timeSinceMidnight < kFiveMinutes)
                return @"around midnight";
            if (timeSinceMidnight < kOneHour * 2)           // up to 2am
                return @"very early this morning";
            if (timeSinceMidnight < kOneHour * 5)           // up to 5am
                return @"early this morning";
            else if (timeSinceMidnight < kOneHour * 11)
                return @"late this morning";
            else
                return @"this morning";
        }


        // NSTimeInterval timeSinceNoonYesterday = timeSinceNoonToday - kOneDay;

        // timeSinceMidnight = -timeSinceMidnight;

        if (timeSinceMidnight < kOneHour * 24)      // not the day before...
        {

            if (timeSinceMidnight < kFiveMinutes)
                return @"around midnight";
            if (timeSinceMidnight < kFifteenMinutes)
                return @"just before midnight";
            if (timeSinceMidnight < kOneHour * 2)           // after 10pm
                return @"late last night";
            if (timeSinceMidnight < kOneHour * 5)           // After 7
                return @"yesterday evening";
            else if (timeSinceMidnight < kOneHour * 7)
                return @"yesterday evening";                // after 5pm
            else if (timeSinceMidnight < kOneHour * 7)
                return @"yesterday evening";                // after 5pm
            else if (timeSinceMidnight < kOneHour * 10)
                return @"yesterday afternoon";              // after 5pm
            else if (timeSinceMidnight < kOneHour * 12)
                return @"early yesterday afternoon";        // before 1pm
            else if (timeSinceMidnight < kOneHour * 13)
                return @"late yesterday morning";           // after 11m
            else if (timeSinceMidnight < kOneHour * 17)
                return @"yesterday morning";                
            else 
                return @"early yesterday morning";
        }

        NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];

        int integerSeconds = timeSinceMidnight;
        int integerDay = kOneDay;
        int secondsIntoDay = integerSeconds % integerDay;
        NSString* formatString = @"last %@";

        if (timeFromNow < kOneWeek)
        {
            if (secondsIntoDay < kFifteenMinutes)
                formatString = @"around midnight on %@";
            //else if (secondsIntoDay < kFifteenMinutes)
            //  formatString = @"just before midnight on %@";
            else if (secondsIntoDay < kOneHour * 2)         // after 10pm
                formatString = @"late on %@ night";
            else if (secondsIntoDay < kOneHour * 5)         // After 7
                formatString = @"on %@ evening";
            else if (secondsIntoDay < kOneHour * 10)
                formatString = @"on %@ afternoon";              // after 5pm
            else if (secondsIntoDay < kOneHour * 12)
                formatString = @"early on %@ afternoon";        // before 1pm
            else if (secondsIntoDay < kOneHour * 13)
                formatString = @"late on %@ morning";           // after 11am
            else if (secondsIntoDay < kOneHour * 17)
                formatString = @"on %@ morning";                
            else if (secondsIntoDay < kOneHour * 24)        // not the day before...
                formatString = @"early on %@ morning";

            [formatter setDateFormat:@"EEEE"];  /// EEEE is long format of day of the week see: http://unicode.org/reports/tr35/tr35-6.html#Date_Format_Patterns
            return [NSString stringWithFormat:formatString, [formatter stringFromDate: self]]; 
        }

        //formatString = @"on %@ the week before last";
        /*if (secondsIntoDay < kOneHour * 2)            // after 10pm
            formatString = @"early on %@ the week before last";
        else if (timeSinceMidnight > kOneHour * 13)
            formatString = @"late on %@ the week before last";          // after 11m*/

        //if (timeFromNow < kOneWeek * 2)
        //{
        //  [formatter setDateFormat:@"EEE"];           /// EEE is short format of day of the week see: http://unicode.org/reports/tr35/tr35-6.html#Date_Format_Patterns
        //  return [NSString stringWithFormat:formatString, [formatter stringFromDate: self]]; 
        //}

        if (timeFromNow < kOneWeek * 2)
            {
            return @"the week before last";
            }

        NSDateComponents* myComponents = [gregorian components:unitFlags fromDate:self];

        int monthsAgo = myComponents.month - todayComponents.month;

        int yearsAgo = myComponents.year - todayComponents.year;
        if (yearsAgo == 0)
        {
            if (monthsAgo == 0)
            {
                if(myComponents.day > 22)
                    return @"late this month";
                if(myComponents.day < 7)
                {

                    if(!earlyMonthStrings)
                    {   
                        earlyMonthStrings = [[NSArray arrayWithObjects:@"earlier this month",
                                                                       //@"at the beginning of the month",
                                                                       @"early this month",
                                                                       nil] retain];
                    }

                    unsigned int index = random() % ([earlyMonthStrings count] - 1);
                    return [earlyMonthStrings objectAtIndex:index];
                }
                return @"earlier this month";
            }

            if (monthsAgo == 1)
            {
                if(myComponents.day > 22)
                    return @"late last month";
                if(myComponents.day < 7)
                    return @"early last month";
                return @"last month";
            }

            formatString  = @"in %@ this year";
            /*if(myComponents.day > 22)
                formatString  = @"late in %@ this year";
            if(myComponents.day < 7)
                formatString  = @"early in %@ this year";*/


            [formatter setDateFormat:@"MMMM"];          /// MMM is longformat of month see: http://unicode.org/reports/tr35/tr35-6.html#Date_Format_Patterns
            return [NSString stringWithFormat:formatString, [formatter stringFromDate: self]];  
        }

        if (yearsAgo == 1)
        {
            formatString  = @"in %@ last year";
            /*if(myComponents.day > 22)
                formatString  = @"late in %@ last year";
            if(myComponents.day < 7)
                formatString  = @"late in %@ last year";*/


            [formatter setDateFormat:@"MMM"];           /// MMM is longformat of month see: http://unicode.org/reports/tr35/tr35-6.html#Date_Format_Patterns
            return [NSString stringWithFormat:formatString, [formatter stringFromDate: self]];  
        }

        // int daysAgo = integerSeconds / integerDay;

    // Nothing yet...
        [formatter setDateStyle:kCFDateFormatterMediumStyle];
        //[formatter setTimeStyle:kCFDateFormatterShortStyle];

        return [NSString stringWithFormat:@"on %@",[formatter stringFromDate: self]];

    }
    else
    if(timeFromNow > 0) // The future
    {
        AICLog(kErrorLogEntry, @"FuzzyDates: Time marked as in the future: referenced date is %@, local time is %@", self, [NSDate date]);
        return @"moments ago";

    }
    else
        return @"right now";    // this seems unlikely.

    return [self description];  // should never get here.
}

抱歉花了这么长时间才发布此内容......

Answer 5

这是基于 Pretty and Humane date & 中的代码。 时间线程。 我添加了对“上周一下午 5 点”的处理，因为 x 天前我就喜欢这样。 这可以处理长达几个世纪的过去和未来。 我热衷于国际化方面，因此最终需要做更多的工作。 计算以当地时区为准。

public static class DateTimePretty
{
    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 WEEK = 7 * DAY;
    private const int MONTH = 30 * DAY;

    private const int YEAR = 365;

    const string now = "just now";
    const string secondsFuture = "in {0} seconds", secondsPast = "{0} seconds ago";
    const string minuteFuture = "in about a minute", minutePast = "about a minute ago";
    const string minutesFuture = "in about {0} minutes", minutesPast = "about {0} minutes ago";
    const string hourFuture = "in about an hour", hourPast = "about an hour ago";
    const string hoursFuture = "in about {0} hours", hoursPast = "about {0} hours ago";
    const string tomorrow = "tomorrow, {0}", yesterday = "yesterday, {0}";
    const string nextDay = "{0}", nextWeekDay = "next {0}", lastDay = "last {0}";
    //const string daysFuture = "in about {0} days", daysPast = "about {0} days ago";
    const string weekFuture = "in about a week", weekPast = "about a week ago";
    const string weeksFuture = "in about {0} weeks", weeksPast = "about {0} weeks ago";
    const string monthFuture = "in about a month", monthPast = "about a month ago";
    const string monthsFuture = "in about {0} months", monthsPast = "about {0} months ago";
    const string yearFuture = "in about a year", yearPast = "about a year ago";
    const string yearsFuture = "in about {0} years", yearsPast = "about {0} years ago";
    const string centuryFuture = "in about a century", centuryPast = "about a century ago";
    const string centuriesFuture = "in about {0} centuries", centuriesPast = "about {0} centuries ago";

    /// <summary>
    /// Returns a pretty version of the provided DateTime: "42 years ago", or "in 9 months".
    /// </summary>
    /// <param name="dateTime">DateTime in local time format, not Utc</param>
    /// <returns>A pretty string</returns>
    public static string GetPrettyDate(DateTime dateTime)
    {
        DateTime dateTimeNow = DateTime.Now;
        bool isFuture = (dateTimeNow.Ticks < dateTime.Ticks);
        var ts = isFuture ? new TimeSpan(dateTime.Ticks - dateTimeNow.Ticks) : new TimeSpan(dateTimeNow.Ticks - dateTime.Ticks);

        double delta = ts.TotalSeconds;

        if (delta < 10)
            return now;
        if (delta < 1 * MINUTE)
            return isFuture ? string.Format(secondsFuture, ts.Seconds) : string.Format(secondsPast, ts.Seconds);
        if (delta < 2 * MINUTE)
            return isFuture ? minuteFuture : minutePast;
        if (delta < 45 * MINUTE)
            return isFuture ? string.Format(minutesFuture, ts.Minutes) : string.Format(minutesPast, ts.Minutes);
        if (delta < 2 * HOUR)
            return isFuture ? hourFuture : hourPast;
        if (delta < 7 * DAY)
        {
            string shortTime = DateTimeFormatInfo.CurrentInfo.ShortTimePattern;
            string shortWeekdayTime = "dddd, " + shortTime;
            int dtDay = (int) dateTime.DayOfWeek;
            int nowDay = (int) dateTimeNow.DayOfWeek;
            if (isFuture)
            {
                if (dtDay == nowDay)
                {
                    if (delta < DAY)
                        return string.Format(hoursFuture, ts.Hours);
                    else
                        return string.Format(nextWeekDay, dateTime.ToString(shortWeekdayTime));
                }
                else if (dtDay - nowDay == 1 || dtDay - nowDay == -6)
                    return string.Format(tomorrow, dateTime.ToString(shortTime));
                else
                    return string.Format(nextDay, dateTime.ToString(shortWeekdayTime));
            }
            else
            {
                if (dtDay == nowDay)
                {
                    if (delta < DAY)
                        return string.Format(hoursPast, ts.Hours);
                    else
                        return string.Format(lastDay, dateTime.ToString(shortWeekdayTime));
                }
                else if (nowDay - dtDay == 1 || nowDay - dtDay == -6)
                    return string.Format(yesterday, dateTime.ToString(shortTime));
                else
                    return string.Format(lastDay, dateTime.ToString(shortWeekdayTime));
            }
        }
        //if (delta < 7 * DAY)
        //    return isFuture ? string.Format(daysFuture, ts.Days) : string.Format(daysPast, ts.Days);
        if (delta < 4 * WEEK)
        {
            int weeks = Convert.ToInt32(Math.Floor((double) ts.Days / 30));
            if (weeks <= 1)
                return isFuture ? weekFuture : weekPast;
            else
                return isFuture ? string.Format(weeksFuture, weeks) : string.Format(weeksPast, weeks);
        }
        if (delta < 12 * MONTH)
        {
            int months = Convert.ToInt32(Math.Floor((double) ts.Days / 30));
            if (months <= 1)
                return isFuture ? monthFuture : monthPast;
            else
                return isFuture ? string.Format(monthsFuture, months) : string.Format(monthsPast, months);
        }

        // Switch to days to avoid overflow
        delta = ts.TotalDays;
        if (delta < 100 * YEAR)
        {
            int years = Convert.ToInt32(Math.Floor((double) ts.TotalDays / 365.25));
            if (years <= 1)
                return isFuture ? yearFuture : yearPast;
            else
                return isFuture ? string.Format(yearsFuture, years) : string.Format(yearsPast, years);
        }
        else
        {
            int centuries = Convert.ToInt32(Math.Floor((double) ts.TotalDays / 365.2425));
            if (centuries <= 1)
                return isFuture ? centuryFuture : centuryPast;
            else
                return isFuture ? string.Format(centuriesFuture, centuries) : string.Format(centuriesPast, centuries);
        }
    }
}

Answer 6

我不知道你为什么说这将是一种可怕的编码实践。 每个返回字符串实际上都是父集的子集，因此您可以在 if/elseif 链中非常优雅地执行此操作。

if timestamp < 5sec
    "A moment ago"
elseif timestamp < 5min 
    "Few minutes ago"
elseif timestamp < 12hr && timestamp < noon
    "Today Morning"
...
elseif timestamp < 1week 
    "Few days ago"
elseif timestamp < 1month
    "Few weeks ago"
elseif timestamp < 6month
    "Few Months ago" 
...
else
    "Really really long time ago"

Answer 7

根据我的经验，这些类型的日期生成器根本不“模糊”。 事实上，它们只是一堆基于 if 语句的时间带。 例如，任何小于 30 秒的时间都是“不久前”，360 到 390 天是“一年前”等。其中一些会使用目标日期来计算特殊名称（六月、星期三等）。
抱歉让你的幻想破灭了。

Answer 8

不用说（但无论如何我都会说）不要使用每年减少 365 天的 where 循环，即使是在 366 天的闰年（否则你会发现自己处于 Zune 开发人员的行列中）

这里是 ac#版本：

http://tiredblogger .wordpress.com/2008/08/21/creating-twitter-esque-relative-dates-in-c/

Answer 9

我知道像这样表达时间最近变得非常流行，但请考虑将其作为切换相对“模糊”日期和正常绝对日期的选项。

例如，知道评论是 5 分钟前发表的很有用，但告诉我评论 A 是 4 小时前而评论 B 是 9 小时前（当时是上午 11 点）就不太有用了，而我更想知道评论 A 是今天早上有人醒来时写的，评论 B 是由熬夜的人写的（假设我知道他们在我的时区）。

--
编辑：仔细看看你的问题，你似乎通过引用一天中的时间而不是“X前”在某种程度上避免了这种情况，但另一方面，如果用户位于不同的时区，你可能会给出错误的印象，因为您的“今天早上”对于相关用户来说可能是半夜。

根据其他用户的时区，用一天中的相对时间来增加时间可能很酷，但这假设用户愿意提供它并且它是正确的。

Answer 10

我对另一个问题的解决方案不满意。 所以我自己使用日期时间类。 IMO，它更干净。 在我的测试中，它按照我想要的方式工作。 希望这对某人有帮助。

DateTime now = DateTime.Now;

long nowticks = now.Ticks;
long thenticks = dt.Ticks;

long diff = nowticks - thenticks;

DateTime n = new DateTime(diff);

if (n.Year > 1)
{
    return n.Year.ToString() + " years ago";
}
else if (n.Month > 1)
{
    return n.Month.ToString() + " months ago";
}
else if (n.Day > 1)
{
    return n.Day.ToString() + " days ago";
}
else if (n.Hour > 1)
{
    return n.Hour.ToString() + " hours ago";
}
else if (n.Minute > 1)
{
    return n.Minute.ToString() + " minutes ago";
}
else
{
    return n.Second.ToString() + " seconds ago";
}

Answer 11

这几乎总是使用巨大的 switch 语句来完成，并且实现起来很简单。

请记住以下几点：

• 始终首先测试最小时间跨度
• 不要忘记保持字符串可本地化。

Answer 12

您可能会发现timeago 来源很有用。 该插件的描述是“一个 jQuery 插件，可以轻松支持自动更新模糊时间戳（例如“4 分钟前”或“大约 1 天前”）”。

它本质上是 Rail 的 distance_of_time_in_words 函数的 JavaScript 端口，塞进了 jQuery 插件中。

Answer 13

我的公司有 这个 .NET 库执行您想要的一些操作，因为它执行非常灵活的日期时间解析（包括一些相对格式），但它只执行非相对输出。

Answer 14

查看 Chrono 的 Javascript 启发式日期解析器。

Chrono 支持大多数日期和时间格式，例如：

Today, Tomorrow, Yesterday, Last Friday, etc
17 August 2013 - 19 August 2013
This Friday from 13:00 - 16.00
5 days ago
Sat Aug 17 2013 18:40:39 GMT+0900 (JST)
2014-11-30T08:15:30-05:30

https://github.com/wanasit/chrono