iOS-时间戳(或date)转字符串

1.时间戳转字符串

///时间戳转化为字符转0000-00-00 00:00

+ (NSString *)time_timestampToString:(NSInteger)timestamp{

    NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp];

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

     [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm"];

    NSString* string=[dateFormat stringFromDate:confromTimesp];

    return string;

}

2.Date转字符串

///date转化为字符转0000-00-00 00:00

+ (NSString *)time_dateToString:(NSDate *)date{

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

    [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm"];

    NSString* string=[dateFormat stringFromDate:date];

    return string;

}

3.计算时间差

- (void)dateDifferenceValue{
    NSString *time2 = @"2018-02-11 00:00:00";
    // 2.将时间转换为date
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
    NSDate *date1 = [NSDate date];
    NSDate *date2 = [formatter dateFromString:time2];
    // 3.创建日历
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSCalendarUnit type = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
    // 4.利用日历对象比较两个时间的差值
    NSDateComponents *cmps = [calendar components:type fromDate:date1 toDate:date2 options:0];
    // 5.输出结果
    NSLog(@"两个时间相差%ld年%ld月%ld日%ld小时%ld分钟%ld秒", cmps.year, cmps.month, cmps.day, cmps.hour, cmps.minute, cmps.second);
}