直接上代碼

// 本地時(shí)間與其他時(shí)間對(duì)比，判斷是否超過(guò)固定時(shí)間
+ (BOOL)overtime:(NSString *)serverTime maxSecond:(CGFloat)maxSec
{
    if (serverTime.length == 0 || maxSec < 0) {
        return NO;
    }
    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
//    fmt.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
//    fmt.locale =[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
    if ([self is12Or24Time]) {
        fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss";
    }else{
        fmt.dateFormat = @"yyyy-MM-dd hh:mm:ss";
    }
    NSDate *serverDate = [fmt dateFromString:serverTime];
//    NSInteger min = [[NSDate date] minutesAfterDate:serverDate];
    if (serverDate == nil) {
        return NO;
    }
    NSTimeInterval timeDiff = [[NSDate date] timeIntervalSinceDate:serverDate];
    NSLog(@"------%.f-------",timeDiff);
    if (fabs(timeDiff) > maxSec) {
        return YES;
    }
    return NO;
}

//當(dāng)前時(shí)間 str類(lèi)型
+ (NSString *)getCurrentTimeString
{
    NSString *sss = @"yyyy-MM-dd hh:mm:ss";
    if ([self is12Or24Time]) {
        sss = @"yyyy-MM-dd HH:mm:ss";
    }
    NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
    [formatter setDateFormat:sss];
    NSString *dateTime=[formatter stringFromDate:[NSDate date]];
    return dateTime;
}

+ (BOOL)is12Or24Time
{
    //獲取系統(tǒng)是24小時(shí)制或者12小時(shí)制
    NSString*formatStringForHours = [NSDateFormatter dateFormatFromTemplate:@"j" options:0 locale:[NSLocale currentLocale]];
    NSRange containsA = [formatStringForHours rangeOfString:@"a"];
    BOOL hasAMPM = containsA.location != NSNotFound;
    //hasAMPM==TURE為12小時(shí)制，否則為24小時(shí)制
    return hasAMPM;
}