时间与时间戳的转换

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时间戳<span>是一种时间表示方式，定义为从</span><a href="http://baike.baidu.com/view/856.htm"
target="_blank">格林威治时间</a><span>1970年01月01日00时00分00秒起至现在的总秒数</span><br>//现在时间

    NSDate
*nowTime = [NSDate
date];

    //获取时区

    NSTimeZone
*zone = [NSTimeZone
systemTimeZone];

    NSInteger
interVal = [zone secondsFromGMTForDate:nowTime];

    NSDate
*localTime = [nowTime dateByAddingTimeInterval:interVal];//本地时间

    //时间戳转为时间

    NSString
*time = @"1400386922";

    NSInteger
dTime = [time integerValue];

    NSDate
*publishTime = [NSDate
dateWithTimeIntervalSince1970:dTime];

    NSLog(@"%@", publishTime);

    //计算时间间隔(localTime - publishTime)

    NSTimeInterval
timeInterval = [localTime timeIntervalSinceDate:publishTime];

    NSLog(@"%f", timeInterval);

    if
(timeInterval < 60) {

        NSString
*time = @"刚刚";

         NSLog(@"刚刚！！");

    }

    if
(timeInterval >= 60 && timeInterval < 3600) {

        int
a = timeInterval / 60;

        NSString
*time = [NSString
stringWithFormat:@"%d分钟前", a];

        NSLog(@"%@", time);

    }

    if
(timeInterval >= 3600 && timeInterval < 3600 * 24) {

        int
a = timeInterval / 3600;

        NSString
*time = [NSString
stringWithFormat:@"%d小时前", a];

        NSLog(@"%@", time);

    }

    if
(timeInterval >= 3600 * 24 && timeInterval < 3600 * 24 * 31) {

        int
a = timeInterval / (3600 * 24);

        NSString
*time = [NSString
stringWithFormat:@"%d天前", a];

       NSLog(@"%@", time);

    }