<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use Nette;


/**
 * DateTime.
 */
class DateTime extends \DateTime implements \JsonSerializable
{
    use Nette\SmartObject;

    /** minute in seconds */
    public const MINUTE = 60;

    /** hour in seconds */
    public const HOUR = 60 * self::MINUTE;

    /** day in seconds */
    public const DAY = 24 * self::HOUR;

    /** week in seconds */
    public const WEEK = 7 * self::DAY;

    /** average month in seconds */
    public const MONTH = 2_629_800;

    /** average year in seconds */
    public const YEAR = 31_557_600;


    /**
     * Creates a DateTime object from a string, UNIX timestamp, or other DateTimeInterface object.
     * @throws \Exception if the date and time are not valid.
     */
    public static function from(string|int|\DateTimeInterface|null $time): static
    {
        if ($time instanceof \DateTimeInterface) {
            return new static($time->format('Y-m-d H:i:s.u'), $time->getTimezone());

        } elseif (is_numeric($time)) {
            if ($time <= self::YEAR) {
                $time += time();
            }

            return (new static)->setTimestamp((int) $time);

        } else { // textual or null
            return new static((string) $time);
        }
    }


    /**
     * Creates DateTime object.
     * @throws Nette\InvalidArgumentException if the date and time are not valid.
     */
    public static function fromParts(
        int $year,
        int $month,
        int $day,
        int $hour = 0,
        int $minute = 0,
        float $second = 0.0,
    ): static
    {
        $s = sprintf('%04d-%02d-%02d %02d:%02d:%02.5F', $year, $month, $day, $hour, $minute, $second);
        if (
            !checkdate($month, $day, $year)
            || $hour < 0
            || $hour > 23
            || $minute < 0
            || $minute > 59
            || $second < 0
            || $second >= 60
        ) {
            throw new Nette\InvalidArgumentException("Invalid date '$s'");
        }

        return new static($s);
    }


    /**
     * Returns new DateTime object formatted according to the specified format.
     */
    public static function createFromFormat(
        string $format,
        string $time,
        string|\DateTimeZone|null $timezone = null,
    ): static|false
    {
        if ($timezone === null) {
            $timezone = new \DateTimeZone(date_default_timezone_get());

        } elseif (is_string($timezone)) {
            $timezone = new \DateTimeZone($timezone);
        }

        $date = parent::createFromFormat($format, $time, $timezone);
        return $date ? static::from($date) : false;
    }


    /**
     * Returns JSON representation in ISO 8601 (used by JavaScript).
     */
    public function jsonSerialize(): string
    {
        return $this->format('c');
    }


    /**
     * Returns the date and time in the format 'Y-m-d H:i:s'.
     */
    public function __toString(): string
    {
        return $this->format('Y-m-d H:i:s');
    }


    /**
     * You'd better use: (clone $dt)->modify(...)
     */
    public function modifyClone(string $modify = ''): static
    {
        $dolly = clone $this;
        return $modify ? $dolly->modify($modify) : $dolly;
    }
}

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