获取某一刻的时间

/**
 *传入时间，返回那时候的时间戳     比如今天或者明天12点的时间戳 
 */
+(NSInteger )my_getFarFrom_12_TimeWithTime:(NSInteger)time
{
    NSDate*date = [NSDate date];
    
    NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT+0800"];
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian];

    [gregorian setTimeZone:gmt];
    NSDateComponents*components = [gregorian components:NSUIntegerMax fromDate: date];
    [components setHour:time]; //12  36
    [components setMinute:0];
    [components setSecond: 0];
    NSDate*newDate = [gregorian dateFromComponents: components];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSInteger timeDur = (NSInteger)[newDate timeIntervalSince1970];
    return timeDur;
}

这个，传0 就是今天0点，12就是12点，24就是明天0点，36就是明天中午12点