List of PHP compatible timezone by ISO 3166-1 alpha-2

state-by-timezone.php

<?php
        $states = array(
            'AL' => 'America/Chicago',
            'AK' => 'America/Anchorage',
            'AZ' => 'America/Phoenix',
            'AR' => 'America/Chicago',
            'CA' => 'America/Los_Angeles',
            'CO' => 'America/Denver',
            'CT' => 'America/New_York',
            'DE' => 'America/New_York',
            'DC' => 'America/New_York',
            'FL' => 'America/New_York',
            'GA' => 'America/New_York',
            'HI' => 'Pacific/Honolulu',
            'ID' => 'America/Denver',
            'IL' => 'America/Chicago',
            'IN' => 'America/New_York',
            'IA' => 'America/Chicago',
            'KS' => 'America/Chicago',
            'KY' => 'America/New_York',
            'LA' => 'America/Chicago',
            'ME' => 'America/New_York',
            'MD' => 'America/New_York',
            'MA' => 'America/New_York',
            'MI' => 'America/New_York',
            'MN' => 'America/Chicago',
            'MS' => 'America/Chicago',
            'MO' => 'America/Chicago',
            'MT' => 'America/Denver',
            'NE' => 'America/Chicago',
            'NV' => 'America/Los_Angeles',
            'NH' => 'America/New_York',
            'NJ' => 'America/New_York',
            'NM' => 'America/Denver',
            'NY' => 'America/New_York',
            'NC' => 'America/New_York',
            'ND' => 'America/Chicago',
            'OH' => 'America/New_York',
            'OK' => 'America/Chicago',
            'OR' => 'America/Los_Angeles',
            'PA' => 'America/New_York',
            'PR' => 'America/New_York',
            'RI' => 'America/New_York',
            'SC' => 'America/New_York',
            'SD' => 'America/Chicago',
            'TN' => 'America/Chicago',
            'TX' => 'America/Chicago', // west tip is Mountain
            'UT' => 'America/Denver',
            'VT' => 'America/New_York',
            'VI' => 'America/New_York',
            'VA' => 'America/New_York',
            'WA' => 'America/Los_Angeles',
            'WV' => 'America/New_York',
            'WI' => 'America/Chicago',
            'WY' => 'America/Denver',
        );