（注：持续更新）
1、时间转时间戳：
- (void)intervalTimeWithDate {
//当前时间
NSDate *date = [NSDate date];
NSTimeInterval timeInterval = [date timeIntervalSince1970]*1000;
NSLog(@"currentDate timeInterval = %f",timeInterval);
}
2、时间戳转时间：
- (void)dateWithIntervalTime {
//当前时间
NSTimeInterval timeInterval = 1474283450000;
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeInterval/1000];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm"];
NSString *dateStr = [formatter stringFromDate:date];
NSLog(@"date = %@",dateStr);
}
3、倒计时
- (void)timeIntervalCompare {
NSTimeInterval timerInterval1 = 1474283450000;
NSTimeInterval timerInterval2 = 1473483450000;
NSInteger timeInterval = (timerInterval2 - timerInterval1)/1000;
int day = (int)(timeInterval/86400);
int hour = (int)((timeInterval - day*86400)/3600);
int minute = (int)(timeInterval - day*86400 - hour*3600)/60;
int second = (int)(timeInterval - day*86400 - hour*3600 - minute*60);
NSLog(@"%d天%d时%d分%d秒",day,hour,minute,second);
}
