从unix时间戳获取人类可读的相对时间和日期？ [英] Getting human readable relative times and dates from a unix timestamp?

问题描述

从像1290529723这样的unix时间戳开始，我将如何（假设gmt）获取有关它的信息：

Starting with a unix timestamp like 1290529723, how would I (assuming gmt) get the information on whether it is:

• 今天（如果是，现在几点）

• today (if so, what time)

过去七天（如果是，哪一天......周一，
等等？ ）

in the last seven days (if so, which day ... mon, tues etc?)

我需要这个消息列表，比如iPhone的Mail应用程序，其中日期/时间相对于当前日期和时间显示，如下所示：

I need this for a list of messages like the iPhone's Mail app, where date/times are shown relative to the current date and time, like so:

15:45
Yesterday
Sunday
Saturday
10/10/10

等

推荐答案

我使用这个方法将unix时间戳更改为一个可读的相对字符串。可能在新的一年的前几天没有正常工作，但希望你太过于注意。

I made this method to change the unix time stamp into a nice readable, relative string. Probably doesn't work properly in the first few days of a new year, but hopefully you should be too hungover to notice.

-(NSString *)relativeTime:(int)datetimestamp
{
    NSDate *aDate = [NSDate dateWithTimeIntervalSince1970:datetimestamp];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    unsigned int unitFlags =  NSYearCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSWeekdayOrdinalCalendarUnit|NSWeekdayCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit;
    NSDateComponents *messageDateComponents = [calendar components:unitFlags fromDate:aDate];
    NSDateComponents *todayDateComponents = [calendar components:unitFlags fromDate:[NSDate date]];

    NSUInteger dayOfYearForMessage = [calendar ordinalityOfUnit:NSDayCalendarUnit inUnit:NSYearCalendarUnit forDate:aDate];
    NSUInteger dayOfYearForToday = [calendar ordinalityOfUnit:NSDayCalendarUnit inUnit:NSYearCalendarUnit forDate:[NSDate date]];


    NSString *dateString;

    if ([messageDateComponents year] == [todayDateComponents year] && 
        [messageDateComponents month] == [todayDateComponents month] &&
        [messageDateComponents day] == [todayDateComponents day]) 
    {
        dateString = [NSString stringWithFormat:@"%02d:%02d", [messageDateComponents hour], [messageDateComponents minute]];
    } else if ([messageDateComponents year] == [todayDateComponents year] && 
               dayOfYearForMessage == (dayOfYearForToday-1))
    {
        dateString = @"Yesterday";
    } else if ([messageDateComponents year] == [todayDateComponents year] &&
               dayOfYearForMessage > (dayOfYearForToday-6))
    {

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"EEEE"];
        dateString = [dateFormatter stringFromDate:aDate];
        [dateFormatter release];

    } else {

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yy"];
        dateString = [NSString stringWithFormat:@"%02d/%02d/%@", [messageDateComponents day], [messageDateComponents month], [dateFormatter stringFromDate:aDate]];
        [dateFormatter release];
    }

    return dateString;
}

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