Time and timestamp related summary – iOS

The specific methods are as follows:

// 2019-02-21 17:30:45 1550741445 /* / NSString *timeInterval = [NSString stringWithFormat:@"%ld", (long)[[NSDate date] timeIntervalSince1970]];
    NSLog(@"Current timestamp: %@ -- Current timestamp to time: %@", timeInterval, YHIntervalToTime(timeInterval));
    NSLog(@"Timestamp conversion time, time format custom: %@", YHDateStringWithTimeInterval(timeInterval, @"Yyy year MM month DD day HH MM minute ss second")); /** dateFormat */ NSString *dateFormat = @"yyyy-MM-dd HH:mm:ss"; /** currentTime Str*/ NSString *currentTime = YHGetCurrentTime(dateFormat); NSLog(@"Current time: %@", currentTime); /** currentDate */ NSDate *currentDate = YHDateFromString(currentTime, dateFormat); NSLog(@"Str turned the Date: % @", currentDate);
    NSLog(@"Str to Date(custom area): %@", YHDateFromStringAndZone(currentTime, dateFormat, [NSTimeZone timeZoneWithAbbreviation:@"UTC"]));
    NSLog(@"The Date turned Str: % @", YHStringFromDate(currentDate, dateFormat));
    
    NSLog(@"Time/date conversion - current week: %@", YHNumDaysWeeks(currentDate));
    NSLog(@"Time/date conversion - current month: %@", YHNumDaysMonth(currentDate));
    
    NSDate *date = YHDateFromString(@"The 2019-02-21 17:30:45", dateFormat);
    if(! YHComparisonDateTimeIsOneDay(date, currentDate, dateFormat)) { NSLog(@"Two different times.");
        
        NSLog(@"Time difference between specified time and current time: %ld", (long)YHSpecifiesDifferenceBetweenTimeAndCcurrentTime(date));
        NSLog(@"Time difference calculation (same time format): %ld",
              (long)YHComparisonDateTimeDifference(date, currentDate, dateFormat));
    }
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