$instance = DateTimeHelper::parse('1400-04-13 15:16:10') : Jalalian
$instance = DateTimeHelper::parse('1400/04/13 15:16:10') : Jalalian
$instance = DateTimeHelper::parse('1400_04_13 15:16:10') : Jalalian

DateTimeHelper::parse('1400-04-13 15:16:10')->format('Y-m-d') : string
// 1400-04-13

DateTimeHelper::parse('1400/04/13 15:16:10')->format('Y/m/d') : string
// 1400/04/13

// Accept H:i Format

DateTimeHelper::parse('1400/04/13 15:16')->format('Y-m-d H:i:s') :  string ('Y-m-d H:i:s')
// 1400-04-13 15:16:00

// Clone

$jalaliDateTime = DateTimeHelper::parse('1400-04-13 15:16:10');
$cloneJalaliDateTime = DateTimeHelper::copy($jalaliDateTime)->format('Y-m-d H:i:s');
// 1400-04-13 15:16:10
// $jalaliDateTime == $cloneJalaliDateTime
// $jalaliDateTime !== $cloneJalaliDateTime

//ignore multiple space from input

$instance = DateTimeHelper::parse('1400-04-13   15:16:10')->format('Y-m-d H:i:s') : string
// 1400-04-13 15:16:10

DateTimeHelper::jalaliToGregorian('1400-04-13 15:16:10') : string ('Y-m-d H:i:s')
// 2021-07-04 15:16:10

DateTimeHelper::jalaliToGregorian('1400-04-13') : string ('Y-m-d H:i:s')
// 2021-07-04 00:00:00

DateTimeHelper::jalaliDiffInMonths('1400-02-23 10:27:52', '1400-04-23 15:16:10') : int
// 2

DateTimeHelper::jalaliDiffInMonths('1400-02-23', '1400-04-23') : int
// 2

DateTimeHelper::jalaliDiffInDays('1400-02-13 15:16:10', '1400-02-23 10:27:52') : int
// 9

DateTimeHelper::jalaliDiffInDays('1400-02-13', '1400-02-23') : int
// 10

DateTimeHelper::jalaliDiffInHours('1400-04-23 15:16:10', '1400-04-23 22:27:52') : int
// 7

DateTimeHelper::jalaliDiffInHours('15:16:10', '22:27:52') : int
// 7

DateTimeHelper::jalaliDiffInMinutes('1400-04-23 15:16:10', '1400-04-23 22:27:52') : int
// 431

DateTimeHelper::jalaliDiffInMinutes('15:16:10', '22:27:52') : int
// 431

DateTimeHelper::clearTime('1400-04-23 15:16:10') :  string ('Y-m-d H:i:s')
// 1400-04-23 00:00:00

DateTimeHelper::getMinutes('1400-04-23 15:16:10') :  int
// 916 = 15*60   16

DateTimeHelper::firstDayOfMonth('1400-04-23 15:16:10') :  string ('Y-m-d H:i:s')
// 1400-04-01 00:00:00

DateTimeHelper::firstDayOfMonth('1400-04-23') :  string ('Y-m-d H:i:s')
// 1400-04-01 00:00:00

DateTimeHelper::lastDayOfMonth('1400-04-23 15:16:10') :  string ('Y-m-d H:i:s')
// 1400-04-31 00:00:00

DateTimeHelper::lastDayOfMonth('1400-08-23') :  string ('Y-m-d H:i:s')
// 1400-08-30 00:00:00

DateTimeHelper::firstDayOfYear() :  string ('Y-m-d H:i:s')
// 1400-01-01 00:00:00

DateTimeHelper::lastDayOfYear() :  string ('Y-m-d H:i:s')
// 1400-12-29 23:59:59