iOS 根据两个时间戳，计算出间隔的时间

 

+(NSString *)dateTimeDifferenceWithStartTime:(NSString *)startTime endTime:(NSString *)endTime;

 

//拿到间隔时间
+(NSString *)dateTimeDifferenceWithStartTime:(NSString *)startTime endTime:(NSString *)endTime{
    NSDateFormatter *date = [[NSDateFormatter alloc]init];
    [date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *startD =[date dateFromString:startTime];
    NSDate *endD = [date dateFromString:endTime];
    NSTimeInterval start = [startD timeIntervalSince1970]*1;
    NSTimeInterval end = [endD timeIntervalSince1970]*1;
    NSTimeInterval value = end - start;
    int second = (int)value %60;//秒
    int minute = (int)value /60%60;
    int house = (int)value % (24 * 3600)/3600;
    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];
    }
    
    return str;
}