datetimefactory.php

<?php
 
namespace Bitrix\Main\UI\Filter;
 
use Bitrix\Main;
 
class DateTimeFactory
{
    public static function createToday(): DateTime
    {
        $dateInUserTimezone = new Main\Type\DateTime();
        $dateInUserTimezone
            ->toUserTime()
            ->setTime(0, 0, 0)
        ;
 
        return new DateTime($dateInUserTimezone->getTimestamp());
    }
 
    public static function createCurrentWeekMonday(): DateTime
    {
        $date = self::getMonday();
 
        return new DateTime($date->getTimestamp());
    }
 
    public static function createNextWeekMonday(): DateTime
    {
        $date = self::getMonday();
        $date->add('+1 week');
 
        return new DateTime($date->getTimestamp());
    }
 
    public static function createLastWeekMonday(): DateTime
    {
        $date = self::getMonday();
        $date->add('-1 week');
 
        return new DateTime($date->getTimestamp());
    }
 
    public static function createFirstDayOfCurrentMonth(): DateTime
    {
        $date = self::getFirstDayOfMonth(strtotime('first day of this month'));
 
        return new DateTime($date->getTimestamp());
    }
 
    public static function createFirstDayOfNextMonth()
    {
        $date = self::getFirstDayOfMonth(strtotime('first day of this month'));
        $date->add('+1 month');
 
        return new DateTime($date->getTimestamp());
    }
 
    public static function createFirstDayOfLastMonth()
    {
        $date = self::getFirstDayOfMonth(strtotime('first day of this month'));
        $date->add('-1 month');
 
        return new DateTime($date->getTimestamp());
    }
 
    private static function getMonday(): Main\Type\DateTime
    {
        $timestamp = strtotime('monday this week');
 
        $date = Main\Type\DateTime::createFromTimestamp($timestamp);
        $date->setTime(0, 0, 0);
 
        $todayDate = new Main\Type\DateTime();
        $todayDate->setTime(0, 0, 0);
 
        if ($date->format('Y-m-d') === $todayDate->format('Y-m-d')) // is it monday today?
        {
            $todayInUserTimezone = new Main\Type\DateTime();;
            $todayInUserTimezone->toUserTime();
 
            if ($todayInUserTimezone->format('N') == '7') // if user date is still previous saturday
            {
                $date->add('-1 week');
            }
        }
 
        return $date;
    }
 
    private static function getFirstDayOfMonth(): Main\Type\DateTime
    {
        $timestamp = strtotime('first day of this month');
 
        $date = Main\Type\DateTime::createFromTimestamp($timestamp);
        $date->setTime(0, 0, 0);
 
        $todayDate = new Main\Type\DateTime();
        $todayDate->setTime(0, 0, 0);
 
        if ($date->format('Y-m-d') === $todayDate->format('Y-m-d')) // is first day of month today?
        {
            $todayInUserTimezone = new Main\Type\DateTime();
            $todayInUserTimezone->toUserTime();
 
            if ((int)($todayInUserTimezone->format('j')) >= 28) // if user date is still previous month
            {
                $date->add('-1 month');
            }
        }
 
        return $date;
    }
}