Get current date and time in a well-kwnown format

How to get the current date and time printed out in standard formats?
Using NSDateFormatter is quite a joke, so this is a powerful function.


/** Get the current date and time in any of the standard formats.

 Parameter "format" must be one of these values:
 0: "dd/MM/yyyy - HH:mm"
 1: "dd_MM_yyyy_HH_mm_ss"
 2: "yyyy-MM-dd"
 3: "HH:mm:ss"
 4: "dd/MM/yyyy - HH:mm:ss"

 @param format Type of format and therefore also the result type.
 @return Returns a string representing the current date and time using selected format.

 */
+ (NSString *)currentDateAndTimeUsingFormatMode:(NSInteger)format {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    switch (format) {
        case 0:
            [formatter setDateFormat:@"dd/MM/yyyy - HH:mm"];
            break;
        case 1:
            [formatter setDateFormat:@"dd_MM_yyyy_HH_mm_ss"];
            break;
        case 2:
            [formatter setDateFormat:@"yyyy-MM-dd"];
            break;
        case 3:
            [formatter setDateFormat:@"HH:mm:ss"];
            break;
        case 4:
            [formatter setDateFormat:@"dd/MM/yyyy - HH:mm:ss"];
            break;
        default:
            [formatter setDateFormat:@"dd/MM/yyyy - HH:mm"];
            break;
    }

    return [formatter stringFromDate:[NSDate date]];
}


Download the ready-for-use source file (.m) of Get current date and time in a well-kwnown format

Get the number of seconds in a time string

How many seconds there are in a given time string value?


/** Converts from string time to seconds.

 Works only if used with this time format "HH:mm:ss".

 @param str Time string in format "HH:mm:ss".
 @return Returns the total number of seconds as NSNumber.
 @see stringTimeFromSeconds:

 */
+ (NSNumber *)secondsInTimeString:(NSString *)str {
    NSNumber *ret = [NSNumber numberWithLong:-1];
    NSMutableArray *tempArr = [[NSMutableArray alloc] initWithArray:[str componentsSeparatedByString:@":"]];
    if ([tempArr count] == 3) {
        ret = [NSNumber numberWithLong: [[tempArr objectAtIndex:0] integerValue]*60*60 + [[tempArr objectAtIndex:1] integerValue]*60 + [[tempArr objectAtIndex:2] integerValue] ];
    }
    return ret;
}


Download the ready-for-use source file (.m) of Get the number of seconds in a time string

Get time format from seconds

I have an amount of seconds that I would convert to a human readable string. What can I do?
Simply use my Objective-C method to accomplish it!
You need:
- http://objective-c-functions.blogspot.com/2013/08/add-zeros-to-digit-number.html


/** Converts from seconds to time string.

 Returned time format is "HH:mm:ss".

 @param sec Number of seconds as NSNumber.
 @return Returns the string time as "HH:mm:ss".
 @see secondsInTimeString:

 */
+ (NSString *)stringTimeFromSeconds:(NSNumber *)sec {
    NSString *ret;
    if ([sec longValue] < 0) {
        LogError(@"Seconds are negative: %ld", sec.longValue);
        ret = @"Undefined";
    } else {
        NSInteger h = floorf( [sec longValue] / 3600 );
        NSInteger m = floorf( ([sec longValue]/60) % 60 );
        NSInteger s = floorf( [sec longValue] % 60 );
        ret = [NSString stringWithFormat:@"%@:%@:%@",
               [LMFunctions twoDigits:h], [LMFunctions twoDigits:m], [LMFunctions twoDigits:s]];
    }
    return ret;
}


Download the ready-for-use source file (.m) of Get time format from seconds

Check if a string is a valid time format

Ever wonder to check if a NSString might represent a valid time? I mean, hours : minutes : seconds ...


/** Check whether a string is a valid time in standard format "HH:mm:ss".

 @param time String time to evaluate.
 @return Returns true if it's a valid string time, false otherwise.

 */
+ (BOOL)isValidTimeString:(NSString *)time {

    NSArray *temp = [time componentsSeparatedByString:@":"];
    if ([temp count] != 3) { return NO;    }

    NSString *h = [temp objectAtIndex:0];
    NSString *m = [temp objectAtIndex:1];
    NSString *s = [temp objectAtIndex:2];

    // Minutes and seconds must be of two digits. Hours, instead, might have any digits.
    if (m.length != 2) { return NO;    }
    if (s.length != 2) { return NO;    }

    // Check values are numeric.
    NSCharacterSet *num09 = [NSCharacterSet decimalDigitCharacterSet];
    if (![num09 isSupersetOfSet:[NSCharacterSet characterSetWithCharactersInString:h]]) { return NO; }
    if (![num09 isSupersetOfSet:[NSCharacterSet characterSetWithCharactersInString:m]]) { return NO; }
    if (![num09 isSupersetOfSet:[NSCharacterSet characterSetWithCharactersInString:s]]) { return NO; }

    // Minute and second values must be lesser than 60.
    if ([m integerValue] >= 60) { return NO; }
    if ([s integerValue] >= 60) { return NO; }

    return YES;
}


Download the ready-for-use source file (.m) of Check if a string is a valid time format