计算两个时间戳之间相差的时间

1。//获取当前时间戳

- (NSInteger )getCurrentTimeStamp {

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

    [formatter setDateStyle:NSDateFormatterMediumStyle];

    [formatter setTimeStyle:NSDateFormatterShortStyle];

    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

    //设置时区,这个对于时间的处理有时很重要

    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

    [formatter setTimeZone:timeZone];

    NSDate *datenow = [NSDate date];//现在时间

    

    //时间转时间戳的方法:

    NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];

    return timeSp;

}

2。／／获取两个时间戳的相差时间

 -（Nsstring）getDateTimeWithLastTime:(Nsinteger )lastTime  NowTime:(Nsinteger)nowTime {

    NSTimeInterval value = nowTime   - lastTime;

    int second = (int)value %60;//秒

    int minute = (int)value /60%60;

    int house = (int)value / (24 *3600)%3600;//时

    int day = (int)value / (24 *3600);

    NSString *str;

    if (day != 0) {

        str = [NSString stringWithFormat:@"耗时%d天%d小时%d分%d秒",day,house,minute,second];

    }else if (day==0 && house !=0) {

        str = [NSString stringWithFormat:@"耗时%d小时%d分%d秒",house,minute,second];

    }else if (day==0 && house==0 && minute!=0) {

        str = [NSString stringWithFormat:@"耗时%d分%d秒",minute,second];

    }else{

        str = [NSString stringWithFormat:@"耗时%d秒",second];

    }

    NSLog(@" %@ ",str);

　　return  str;

}