English to Bengali Calendar Date Converter for Laravel Framework

BengaliDate.php

<?php

namespace App\Helpers;

use Illuminate\Support\Carbon;
use Illuminate\Support\Number;

/**
 * @author Narayan Adhikar
 * @link https://gist.github.com/wovosoft/9b4bd4f9b340c72c8ba4de04ce8e8d24
 * Laravel version of
 * @see https://github.com/tareq1988/bangla-date/blob/master/class.banglaDate.php
 */
class BengaliDate
{
    private int $day;
    private int $month;
    private int $year;

    public const StartsAtNight   = 24;
    public const StartsAtMorning = 6;

    const Months = [
        "পৌষ", "মাঘ", "ফাল্গুন", "চৈত্র", "বৈশাখ", "জ্যৈষ্ঠ", "আষাঢ়", "শ্রাবণ", "ভাদ্র", "আশ্বিন", "কার্তিক", "অগ্রহায়ণ"
    ];

    const LastDayInMonths = [
        30, 30, 30, 30, 31, 31, 31, 31, 31, 30, 30, 30
    ];

    const MidDates = [
        13, 12, 14, 13, 14, 14, 15, 15, 15, 15, 14, 14
    ];

    public function __construct(
        private readonly Carbon $timestamp,
        private readonly int    $morning = self::StartsAtNight
    )
    {
        [$this->day, $this->month, $this->year] = $this->convert();
    }

    public static function createFrom(string|Carbon $date, int $morning = self::StartsAtNight): static
    {
        if ($date instanceof Carbon) {
            return new static($date, $morning);
        }

        return new static(Carbon::parse($date), $morning);
    }

    /**
     * @param string $format %M = Short Month, %Y = Full Year, %y = Short Year, %d = Day
     * @return string
     */
    public function format(string $format): string
    {
        return strtr($format, [
            '%M' => self::Months[$this->month],
            '%m' => str(Number::format($this->month + 1, locale: 'bn-BD'))
                ->replace(',', '')
                ->padLeft(2, '০')
                ->value(),
            '%Y' => str(Number::format($this->year, locale: 'bn-BD'))
                ->replace(',', '')
                ->value(),
            '%y' => str(Number::format(str($this->year)->substr(2, 2)->toInteger(), locale: 'bn-BD'))
                ->replace(',', '')
                ->value(),
            '%d' => Number::format($this->day, locale: 'bn-BD')
        ]);
    }

    private function convert(): array
    {
        $days = $this->timestamp->day - self::MidDates[$this->timestamp->month - 1];
        $hours = $this->timestamp->format('G');

        if ($hours < $this->morning) {
            $days -= 1;
        }

        if (
            ($this->timestamp->day <= self::MidDates[$this->timestamp->month - 1])
            || ($this->timestamp->day == self::MidDates[$this->timestamp->month - 1] + 1 && $hours < $this->morning)
        ) {
            $days += self::LastDayInMonths[$this->timestamp->month - 1];

            if ($this->timestamp->isLeapYear()) {
                $days += 1;
            }
            $months = $this->timestamp->month - 1;
        } else {
            $months = ($this->timestamp->month) % 12;
        }

        $year = $this->timestamp->year - 593;

        if (($this->timestamp->month < 4) || (($this->timestamp->month == 4) && (($this->timestamp->day < 14) || ($this->timestamp->day == 14 && $hours < $this->morning)))) {
            $year -= 1;
        }

        return [
            $days, $months, $year
        ];
    }
}

** Usage **

\App\Helpers\BengaliDate::createFrom(now())->format("%d %M %Y বঙ্গাব্দ");