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77 lines
1.9 KiB
77 lines
1.9 KiB
<?php
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/*
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* Get the offset of a timezone
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*/
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function getTimezoneOffset($timezone)
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{
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$tz = new DateTimeZone($timezone);
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$utc = new DateTimeZone('UTC');
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return $tz->getOffset(new DateTime('now', $utc));
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}
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/*
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* Prettify an offset
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*/
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function getPrettyOffset($offset)
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{
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$offset_prefix = $offset < 0 ? '-' : '+';
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$offset_formatted = gmdate('H:i', abs($offset));
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return 'UTC'.$offset_prefix.$offset_formatted;
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}
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/*
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* Generate the timezone list
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*/
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function generateTimezoneList()
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{
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$regions = [
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DateTimeZone::AFRICA,
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DateTimeZone::AMERICA,
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DateTimeZone::ANTARCTICA,
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DateTimeZone::ASIA,
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DateTimeZone::ATLANTIC,
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DateTimeZone::AUSTRALIA,
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DateTimeZone::EUROPE,
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DateTimeZone::INDIAN,
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DateTimeZone::PACIFIC,
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];
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$timezones = [];
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foreach ($regions as $region)
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{
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$timezones = array_merge( $timezones, DateTimeZone::listIdentifiers( $region ) );
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}
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$timezone_offsets_summer = [];
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$timezone_offsets_winter = [];
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foreach ($timezones as $timezone)
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{
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$tz = new DateTimeZone($timezone);
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$utc = new DateTimeZone('UTC');
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$timezone_offsets_summer[$timezone] = $tz->getOffset(new DateTime('first day of August', $utc));
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$timezone_offsets_winter[$timezone] = $tz->getOffset(new DateTime('first day of December', $utc));
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}
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// sort timezone by timezone name
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ksort($timezone_offsets_summer);
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ksort($timezone_offsets_winter);
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$timezone_list = [];
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foreach ($timezone_offsets_summer as $timezone => $offset)
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{
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$pretty_summer_offset = getPrettyOffset($offset);
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$pretty_winter_offset = getPrettyOffset($timezone_offsets_winter[$timezone]);
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$split = explode("/", $timezone);
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$timezone_list[$timezone] = "$split[1]/$split[0] (Summer ${pretty_summer_offset} - Winter ${pretty_winter_offset})";
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}
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ksort($timezone_list);
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return $timezone_list;
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}
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