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class OsTimeHelper {

	private static $timezone = false;


	public static function get_db_weekday_by_number( $number ) {
		$weekdays = [ &#039;mo&#039;, &#039;tu&#039;, &#039;we&#039;, &#039;th&#039;, &#039;fr&#039;, &#039;sa&#039;, &#039;su&#039; ];

		return $weekdays[ $number - 1 ];
	}

	public static function is_valid_date( $date_string ) {
		if(empty($date_string)) return false;
		return (bool) strtotime( $date_string );
	}

	public static function reformat_date_string( $date_string, $from_format, $to_format ) {
		$start_date_obj = OsWpDateTime::os_createFromFormat( $from_format, $date_string );

		return $start_date_obj-&gt;format( $to_format );
	}

	public static function nice_date( $date ) {
		if ( $date == OsTimeHelper::today_date( &#039;Y-m-d&#039; ) ) {
			$nice_date = __( &#039;Today&#039;, &#039;latepoint&#039; );
		} else {
			$nice_date = self::get_nice_date_with_optional_year( $date, true );
		}

		return $nice_date;
	}

	public static function date_from_db( $date_string, $format = false, string $output_timezone_name = &#039;UTC&#039; ) {
		$timezone = new DateTimeZone( &#039;UTC&#039; );
		$date_obj = OsWpDateTime::os_createFromFormat( LATEPOINT_DATETIME_DB_FORMAT, $date_string, $timezone );
		if(empty($date_obj)) $date_obj = self::now_datetime_object();
		$date_obj-&gt;setTimezone( new DateTimeZone( $output_timezone_name ) );
		if ( $format ) {
			return $date_obj-&gt;format( $format );
		}

		return $date_obj;
	}

	public static function today_date( $date_format = &#039;Y-m-d&#039; ) {
		$today = new OsWpDateTime( &#039;today&#039; );

		return $today-&gt;format( $date_format );
	}

	public static function now_datetime_in_format( $date_format = LATEPOINT_DATETIME_DB_FORMAT, string $timezone = &#039;UTC&#039; ) {
		$now = self::now_datetime_object();
		$now-&gt;setTimezone( new DateTimeZone( &quot;UTC&quot; ) );

		return $now-&gt;format( $date_format );
	}

	public static function now_datetime_utc() {
		$now = self::now_datetime_object();
		$now-&gt;setTimezone( new DateTimeZone( &quot;UTC&quot; ) );

		return $now;
	}

	public static function time_left_to_datetime( string $datetime, DateTimeZone $timezone ) {

		$now_datetime   = new OsWpDateTime( &#039;now&#039;, $timezone );
		$event_datetime = OsWpDateTime::createFromFormat( LATEPOINT_DATETIME_DB_FORMAT, $datetime, $timezone );
		$css_class      = &#039;left-days&#039;;

		$before    = ( $now_datetime &lt; $event_datetime ) ? __( &#039;in&#039;, &#039;latepoint&#039; ) . &#039; &#039; : &#039;&#039;;
		$ago       = ( $now_datetime &gt; $event_datetime ) ? &#039; &#039; . __( &#039;ago&#039;, &#039;latepoint&#039; ) : &#039;&#039;;
		$ago_class = empty( $ago ) ? &#039;&#039; : &#039;time-past&#039;;
		if ( $event_datetime ) {
			$diff = $now_datetime-&gt;diff( $event_datetime );
			if ( $diff-&gt;d &gt; 0 ) {
				$left = $before . $diff-&gt;format( &#039;%a &#039; . __( &#039;days&#039;, &#039;latepoint&#039; ) ) . $ago;
			} else {
				if ( $diff-&gt;h &gt; 0 ) {
					$css_class = &#039;left-hours&#039;;
					$left      = $before . $diff-&gt;format( &#039;%h &#039; . __( &#039;hours&#039;, &#039;latepoint&#039; ) ) . $ago;
				} else {
					$css_class = &#039;left-minutes&#039;;
					$left      = $before . $diff-&gt;format( &#039;%i &#039; . __( &#039;minutes&#039;, &#039;latepoint&#039; ) ) . $ago;
				}
			}
		} else {
			$left = &#039;n/a&#039;;
		}

		return &#039;&lt;span class=&quot;time-left &#039; . esc_attr( $css_class ) . &#039; &#039; . esc_attr( $ago_class ) . &#039;&quot;&gt;&#039; . esc_html( $left ) . &#039;&lt;/span&gt;&#039;;
	}

	public static function now_datetime_utc_in_db_format() {
		return OsWpDateTime::datetime_in_utc( new OsWpDateTime( &#039;now&#039; ), LATEPOINT_DATETIME_DB_FORMAT );
	}

	public static function custom_datetime_utc_in_db_format( string $time = &#039;now&#039; ): string {
		return OsWpDateTime::datetime_in_utc( new OsWpDateTime( $time ), LATEPOINT_DATETIME_DB_FORMAT );
	}

	public static function now_datetime_in_db_format() {
		return self::now_datetime_in_format( LATEPOINT_DATETIME_DB_FORMAT );
	}

	public static function now_datetime_object() {
		return new OsWpDateTime( &#039;now&#039; );
	}

	public static function get_time_system() {
		return OsSettingsHelper::get_time_system();
	}

	public static function get_time_format() {
		return self::is_army_clock() ? &#039;H:i&#039; : &#039;g:ia&#039;;
	}

	public static function is_army_clock() {
		return ( self::get_time_system() == 24 );
	}

	public static function get_time_systems_list_for_select() {
		return array(
			array( &#039;value&#039; =&gt; &#039;12&#039;, &#039;label&#039; =&gt; __( &#039;12-hour clock&#039;, &#039;latepoint&#039; ) ),
			array( &#039;value&#039; =&gt; &#039;24&#039;, &#039;label&#039; =&gt; __( &#039;24-hour clock&#039;, &#039;latepoint&#039; ) )
		);
	}

	public static function get_date_formats_list_for_select() {
		return array(
			array( &#039;value&#039; =&gt; &#039;m/d/Y&#039;, &#039;label&#039; =&gt; __( &#039;MM/DD/YYYY&#039;, &#039;latepoint&#039; ) ),
			array( &#039;value&#039; =&gt; &#039;m.d.Y&#039;, &#039;label&#039; =&gt; __( &#039;MM.DD.YYYY&#039;, &#039;latepoint&#039; ) ),
			array( &#039;value&#039; =&gt; &#039;d/m/Y&#039;, &#039;label&#039; =&gt; __( &#039;DD/MM/YYYY&#039;, &#039;latepoint&#039; ) ),
			array( &#039;value&#039; =&gt; &#039;d.m.Y&#039;, &#039;label&#039; =&gt; __( &#039;DD.MM.YYYY&#039;, &#039;latepoint&#039; ) ),
			array( &#039;value&#039; =&gt; &#039;Y-m-d&#039;, &#039;label&#039; =&gt; __( &#039;YYYY-MM-DD&#039;, &#039;latepoint&#039; ) )
		);
	}

	public static function get_time_systems_list() {
		return array( &#039;12&#039; =&gt; __( &#039;12-hour clock&#039;, &#039;latepoint&#039; ), &#039;24&#039; =&gt; __( &#039;24-hour clock&#039;, &#039;latepoint&#039; ) );
	}


	public static function format_date_with_locale( string $format, DateTime $date_obj ): string {
		return OsUtilHelper::translate_months( $date_obj-&gt;format( $format ) );
	}


	public static function get_nice_date_with_optional_year( $date, $show_year_if_not_current = true, $short_month = false ) {
		$d = OsWpDateTime::os_createFromFormat( &quot;Y-m-d&quot;, $date );
		if ( ! $d ) {
			return $date;
		}
		if ( ! $show_year_if_not_current || ( $d-&gt;format( &#039;Y&#039; ) == OsTimeHelper::today_date( &#039;Y&#039; ) ) ) {
			return OsUtilHelper::translate_months( $d-&gt;format( OsSettingsHelper::get_readable_date_format( true, $short_month ) ) );
		} else {
			return OsUtilHelper::translate_months( $d-&gt;format( OsSettingsHelper::get_readable_date_format( false, $short_month) ) );
		}
	}

	public static function get_readable_date( DateTime $date, string $output_timezone_name = &#039;&#039; ): string {
		if ( empty( $output_timezone_name ) ) {
			$output_timezone_name = self::get_wp_timezone_name();
		}
		$date-&gt;setTimezone( new DateTimeZone( $output_timezone_name ) );

		return self::format_date_with_locale( OsSettingsHelper::get_readable_date_format(), $date );
	}

	public static function get_readable_date_from_string( string $date, string $input_timezone_name = &#039;&#039;, string $output_timezone_name = &#039;&#039; ): string {
		if ( empty( $input_timezone_name ) ) {
			$input_timezone_name = &#039;UTC&#039;;
		}
		if ( empty( $output_timezone_name ) ) {
			$output_timezone_name = self::get_wp_timezone_name();
		}

		$date_obj = new OsWpDateTime( $date, new DateTimeZone( $input_timezone_name ) );

		return self::get_readable_date( $date_obj, $output_timezone_name );
	}

	public static function get_wp_timezone() {
		if ( self::$timezone ) {
			return self::$timezone;
		}
		try{
			$timezone_string = get_option( &#039;timezone_string&#039; );
			if ( ! empty( $timezone_string ) ) {
				return new DateTimeZone( $timezone_string );
			}
			$offset         = get_option( &#039;gmt_offset&#039; );
			$hours          = (int) $offset;
			$minutes        = abs( ( $offset - (int) $offset ) * 60 );
			$offset         = sprintf( &#039;%+03d:%02d&#039;, $hours, $minutes );
			self::$timezone = new DateTimeZone( $offset );
		}catch(Exception $e){
			return new DateTimeZone(&#039;UTC&#039;);
		}

		return self::$timezone;
	}

	public static function get_wp_timezone_name() {
		$timezone_obj = self::get_wp_timezone();
		if ( $timezone_obj ) {
			return $timezone_obj-&gt;getName();
		} else {
			return &#039;America/New_York&#039;;
		}
	}

	public static function get_timezone_from_session() {
		try {
			$timezone = new DateTimeZone( self::get_timezone_name_from_session() );
		} catch ( Exception $e ) {
			$timezone = new DateTimeZone( self::get_wp_timezone_name() );
		}

		return $timezone;
	}

	public static function get_timezone_name_from_session() {
		$timezone_name = self::get_wp_timezone_name();
		$timezone_name = apply_filters( &#039;latepoint_timezone_name_from_session&#039;, $timezone_name );

		return $timezone_name;
	}

	public static function is_timezone_saved_in_session() {
		return ( isset( $_COOKIE[ LATEPOINT_SELECTED_TIMEZONE_COOKIE ] ) &amp;&amp; ! empty( $_COOKIE[ LATEPOINT_SELECTED_TIMEZONE_COOKIE ] ) );
	}

	public static function set_timezone_name_in_cookie( $timezone_name ) {
		OsSessionsHelper::setcookie( LATEPOINT_SELECTED_TIMEZONE_COOKIE, $timezone_name );
		$_COOKIE[ LATEPOINT_SELECTED_TIMEZONE_COOKIE ] = $timezone_name;
	}


	public static function convert_datetime_to_minutes( DateTime $datetime ) {
		return $datetime-&gt;format( &#039;i&#039; ) + ( $datetime-&gt;format( &#039;G&#039; ) * 60 );
	}

	public static function get_current_minutes(  ) {
		$now = new OsWpDateTime( &#039;now&#039; );
		return $now-&gt;format( &#039;i&#039; ) + ( $now-&gt;format( &#039;G&#039; ) * 60 );
	}

	public static function convert_time_to_minutes( $time, $ampm = false ) {
		if ( strpos( $time, &#039;:&#039; ) === false ) {
			return 0;
		}

		list( $hours, $minutes ) = explode( &#039;:&#039;, $time );
		if ( $hours == &#039;12&#039; &amp;&amp; $ampm == &#039;am&#039; ) {
			// midnight
			$hours = &#039;0&#039;;
		}
		if ( $ampm == &#039;pm&#039; &amp;&amp; $hours &lt; 12 ) {
			// convert to 24 hour format
			$hours = $hours + 12;
		}
		$minutes = ( $hours * 60 ) + $minutes;

		return $minutes;
	}

	public static function am_or_pm( $minutes ) {
		if ( self::is_army_clock() ) {
			return &#039;&#039;;
		}

		return ( $minutes &lt; 720 ) ? &#039;am&#039; : &#039;pm&#039;;
	}

	public static function minutes_to_hours( $time ) {
		if ( $time ) {
			$hours = floor( $time / 60 );
			if ( ! self::is_army_clock() &amp;&amp; $hours &gt; 12 ) {
				$hours = $hours - 12;
			}
			if ( ! self::is_army_clock() &amp;&amp; ! $hours ) {
				$hours = 12;
			}

			return $hours;
		} else {
			// if am/pm - we don&#039;t show 0, we show 12
			return ( self::is_army_clock() ) ? 0 : 12;
		}
	}


	public static function minutes_to_army_hours_and_minutes( $time_in_minutes ) {
		if ( is_null( $time_in_minutes ) || $time_in_minutes === &#039;&#039; ) {
			return __( &#039;n/a&#039;, &#039;latepoint&#039; );
		}
		$hours   = floor( $time_in_minutes / 60 );
		$minutes = ( $time_in_minutes % 60 );

		return sprintf( &#039;%02d:%02d&#039;, $hours, $minutes );
	}

	public static function minutes_to_hours_and_minutes( $minutes, $format = &#039;%02d:%02d&#039;, $add_ampm = true, $hide_if_zero_minutes = false ) {
		if ( is_null( $minutes ) ) {
			return &#039;n/a&#039;;
		}
		if ( ! $format ) {
			$format = &#039;%02d:%02d&#039;;
		}

		if ( $minutes === &#039;&#039; ) {
			return;
		}
		$ampm    = ( $add_ampm ) ? self::am_or_pm( $minutes ) : &#039;&#039;;
		$hours   = self::minutes_to_hours( $minutes );
		$minutes = ( $minutes % 60 );
		if ( $hide_if_zero_minutes &amp;&amp; ! $minutes ) {
			return $hours . &#039; &#039; . $ampm;
		} else {
			return sprintf( $format, $hours, $minutes ) . $ampm;
		}
	}


	public static function timezones_options_list_styled( $selected_zone, $locale = null ) {
		static $mo_loaded = false, $locale_loaded = null;

		$continents = array( &#039;Africa&#039;, &#039;America&#039;, &#039;Antarctica&#039;, &#039;Arctic&#039;, &#039;Asia&#039;, &#039;Atlantic&#039;, &#039;Australia&#039;, &#039;Europe&#039;, &#039;Indian&#039;, &#039;Pacific&#039; );

		// Load translations for continents and cities.
		if ( ! $mo_loaded || $locale !== $locale_loaded ) {
			$locale_loaded = $locale ? $locale : get_locale();
			$mofile        = WP_LANG_DIR . &#039;/continents-cities-&#039; . $locale_loaded . &#039;.mo&#039;;
			unload_textdomain( &#039;continents-cities&#039; );
			load_textdomain( &#039;continents-cities&#039;, $mofile );
			$mo_loaded = true;
		}

		$time_format = self::get_time_format();

		$zonen = array();
		foreach ( timezone_identifiers_list() as $zone ) {
			$zone = explode( &#039;/&#039;, $zone );
			if ( ! in_array( $zone[0], $continents ) ) {
				continue;
			}

			// This determines what gets set and translated - we don&#039;t translate Etc/* strings here, they are done later
			$exists    = array(
				0 =&gt; ( isset( $zone[0] ) &amp;&amp; $zone[0] ),
				1 =&gt; ( isset( $zone[1] ) &amp;&amp; $zone[1] ),
				2 =&gt; ( isset( $zone[2] ) &amp;&amp; $zone[2] ),
			);
			$exists[3] = ( $exists[0] &amp;&amp; &#039;Etc&#039; !== $zone[0] );
			$exists[4] = ( $exists[1] &amp;&amp; $exists[3] );
			$exists[5] = ( $exists[2] &amp;&amp; $exists[3] );

			// phpcs:disable WordPress.WP.I18n.LowLevelTranslationFunction,WordPress.WP.I18n.NonSingularStringLiteralText
			$zonen[] = array(
				&#039;continent&#039;   =&gt; ( $exists[0] ? $zone[0] : &#039;&#039; ),
				&#039;city&#039;        =&gt; ( $exists[1] ? $zone[1] : &#039;&#039; ),
				&#039;subcity&#039;     =&gt; ( $exists[2] ? $zone[2] : &#039;&#039; ),
				&#039;t_continent&#039; =&gt; ( $exists[3] ? translate( str_replace( &#039;_&#039;, &#039; &#039;, $zone[0] ), &#039;continents-cities&#039; ) : &#039;&#039; ),
				&#039;t_city&#039;      =&gt; ( $exists[4] ? translate( str_replace( &#039;_&#039;, &#039; &#039;, $zone[1] ), &#039;continents-cities&#039; ) : &#039;&#039; ),
				&#039;t_subcity&#039;   =&gt; ( $exists[5] ? translate( str_replace( &#039;_&#039;, &#039; &#039;, $zone[2] ), &#039;continents-cities&#039; ) : &#039;&#039; ),
			);
			// phpcs:enable
		}
		usort( $zonen, &#039;_wp_timezone_choice_usort_callback&#039; );

		$structure = array();

		foreach ( $zonen as $key =&gt; $zone ) {
			// Build value in an array to join later
			$value = array( $zone[&#039;continent&#039;] );

			if ( empty( $zone[&#039;city&#039;] ) ) {
				// It&#039;s at the continent level (generally won&#039;t happen)
				$display = $zone[&#039;t_continent&#039;];
			} else {
				// It&#039;s inside a continent group

				// Continent optgroup
				if ( ! isset( $zonen[ $key - 1 ] ) || $zonen[ $key - 1 ][&#039;continent&#039;] !== $zone[&#039;continent&#039;] ) {
					$label       = $zone[&#039;t_continent&#039;];
					$structure[] = &#039;&lt;div class=&quot;os-timezone-group&quot;&gt;&lt;div class=&quot;os-timezone-group-header&quot;&gt;&#039;.esc_html( $label ).&#039;&lt;/div&gt;&#039;;
				}

				// Add the city to the value
				$value[] = $zone[&#039;city&#039;];

				$display = $zone[&#039;t_city&#039;];
				if ( ! empty( $zone[&#039;subcity&#039;] ) ) {
					// Add the subcity to the value
					$value[] = $zone[&#039;subcity&#039;];
					$display .= &#039; - &#039; . $zone[&#039;t_subcity&#039;];
				}
			}

			// Build the value
			$value    = join( &#039;/&#039;, $value );
			$selected = &#039;&#039;;
			if ( $value === $selected_zone ) {
				$selected = &#039;selected&#039;;
			}
			try {
				$local_time = new OsWpDateTime(&#039;now&#039;, new DateTimeZone($value));
				$local_time_value = $local_time-&gt;format($time_format);
			}catch(Exception $e){
				$local_time_value = &#039;&#039;;
			}
			$structure[] = &#039;&lt;div class=&quot;os-timezone-selector-option &#039; . $selected . &#039;&quot; data-value=&quot;&#039; . esc_attr( $value ) . &#039;&quot;&gt;&lt;div&gt;&#039; . esc_html( $display ) . &#039;&lt;/div&gt;&lt;div class=&quot;os-timezone-selector-option-local-time&quot;&gt;&#039;.$local_time_value.&#039;&lt;/div&gt;&lt;/div&gt;&#039;;

			// Close continent optgroup
			if ( ! empty( $zone[&#039;city&#039;] ) &amp;&amp; ( ! isset( $zonen[ $key + 1 ] ) || ( isset( $zonen[ $key + 1 ] ) &amp;&amp; $zonen[ $key + 1 ][&#039;continent&#039;] !== $zone[&#039;continent&#039;] ) ) ) {
				$structure[] = &#039;&lt;/div&gt;&#039;;
			}
		}

		// Do UTC
		$structure[] = &#039;&lt;div class=&quot;os-timezone-group&quot;&gt;&lt;div class=&quot;os-timezone-group-header&quot;&gt;&#039;.esc_attr__( &#039;UTC&#039;, &#039;latepoint&#039; ).&#039;&lt;/div&gt;&#039;;
		$selected    = &#039;&#039;;
		if ( &#039;UTC&#039; === $selected_zone ) {
			$selected = &#039;selected&#039;;
		}
		$structure[] = &#039;&lt;div class=&quot;os-timezone-selector-option &#039; . $selected . &#039; data-value=&quot;&#039; . esc_attr( &#039;UTC&#039; ) . &#039;&quot;&gt;&#039; . __( &#039;UTC&#039;, &#039;latepoint&#039; ) . &#039;&lt;/div&gt;&#039;;
		$structure[] = &#039;&lt;/div&gt;&#039;;

		return join( &quot;\n&quot;, $structure );
	}

	public static function timezones_options_list( $selected_zone, $locale = null ) {
		static $mo_loaded = false, $locale_loaded = null;

		$continents = array( &#039;Africa&#039;, &#039;America&#039;, &#039;Antarctica&#039;, &#039;Arctic&#039;, &#039;Asia&#039;, &#039;Atlantic&#039;, &#039;Australia&#039;, &#039;Europe&#039;, &#039;Indian&#039;, &#039;Pacific&#039; );

		// Load translations for continents and cities.
		if ( ! $mo_loaded || $locale !== $locale_loaded ) {
			$locale_loaded = $locale ? $locale : get_locale();
			$mofile        = WP_LANG_DIR . &#039;/continents-cities-&#039; . $locale_loaded . &#039;.mo&#039;;
			unload_textdomain( &#039;continents-cities&#039; );
			load_textdomain( &#039;continents-cities&#039;, $mofile );
			$mo_loaded = true;
		}

		$zonen = array();
		foreach ( timezone_identifiers_list() as $zone ) {
			$zone = explode( &#039;/&#039;, $zone );
			if ( ! in_array( $zone[0], $continents ) ) {
				continue;
			}

			// This determines what gets set and translated - we don&#039;t translate Etc/* strings here, they are done later
			$exists    = array(
				0 =&gt; ( isset( $zone[0] ) &amp;&amp; $zone[0] ),
				1 =&gt; ( isset( $zone[1] ) &amp;&amp; $zone[1] ),
				2 =&gt; ( isset( $zone[2] ) &amp;&amp; $zone[2] ),
			);
			$exists[3] = ( $exists[0] &amp;&amp; &#039;Etc&#039; !== $zone[0] );
			$exists[4] = ( $exists[1] &amp;&amp; $exists[3] );
			$exists[5] = ( $exists[2] &amp;&amp; $exists[3] );

			// phpcs:disable WordPress.WP.I18n.LowLevelTranslationFunction,WordPress.WP.I18n.NonSingularStringLiteralText
			$zonen[] = array(
				&#039;continent&#039;   =&gt; ( $exists[0] ? $zone[0] : &#039;&#039; ),
				&#039;city&#039;        =&gt; ( $exists[1] ? $zone[1] : &#039;&#039; ),
				&#039;subcity&#039;     =&gt; ( $exists[2] ? $zone[2] : &#039;&#039; ),
				&#039;t_continent&#039; =&gt; ( $exists[3] ? translate( str_replace( &#039;_&#039;, &#039; &#039;, $zone[0] ), &#039;continents-cities&#039; ) : &#039;&#039; ),
				&#039;t_city&#039;      =&gt; ( $exists[4] ? translate( str_replace( &#039;_&#039;, &#039; &#039;, $zone[1] ), &#039;continents-cities&#039; ) : &#039;&#039; ),
				&#039;t_subcity&#039;   =&gt; ( $exists[5] ? translate( str_replace( &#039;_&#039;, &#039; &#039;, $zone[2] ), &#039;continents-cities&#039; ) : &#039;&#039; ),
			);
			// phpcs:enable
		}
		usort( $zonen, &#039;_wp_timezone_choice_usort_callback&#039; );

		$structure = array();

		if ( empty( $selected_zone ) ) {
			$structure[] = &#039;&lt;option selected=&quot;selected&quot; value=&quot;&quot;&gt;&#039; . __( &#039;Select a city&#039;, &#039;latepoint&#039; ) . &#039;&lt;/option&gt;&#039;;
		}

		foreach ( $zonen as $key =&gt; $zone ) {
			// Build value in an array to join later
			$value = array( $zone[&#039;continent&#039;] );

			if ( empty( $zone[&#039;city&#039;] ) ) {
				// It&#039;s at the continent level (generally won&#039;t happen)
				$display = $zone[&#039;t_continent&#039;];
			} else {
				// It&#039;s inside a continent group

				// Continent optgroup
				if ( ! isset( $zonen[ $key - 1 ] ) || $zonen[ $key - 1 ][&#039;continent&#039;] !== $zone[&#039;continent&#039;] ) {
					$label       = $zone[&#039;t_continent&#039;];
					$structure[] = &#039;&lt;optgroup label=&quot;&#039; . esc_attr( $label ) . &#039;&quot;&gt;&#039;;
				}

				// Add the city to the value
				$value[] = $zone[&#039;city&#039;];

				$display = $zone[&#039;t_city&#039;];
				if ( ! empty( $zone[&#039;subcity&#039;] ) ) {
					// Add the subcity to the value
					$value[] = $zone[&#039;subcity&#039;];
					$display .= &#039; - &#039; . $zone[&#039;t_subcity&#039;];
				}
			}

			// Build the value
			$value    = join( &#039;/&#039;, $value );
			$selected = &#039;&#039;;
			if ( $value === $selected_zone ) {
				$selected = &#039;selected=&quot;selected&quot; &#039;;
			}
			$structure[] = &#039;&lt;option &#039; . $selected . &#039;value=&quot;&#039; . esc_attr( $value ) . &#039;&quot;&gt;&#039; . esc_html( $label ) . &#039;, &#039; . esc_html( $display ) . &#039;&lt;/option&gt;&#039;;

			// Close continent optgroup
			if ( ! empty( $zone[&#039;city&#039;] ) &amp;&amp; ( ! isset( $zonen[ $key + 1 ] ) || ( isset( $zonen[ $key + 1 ] ) &amp;&amp; $zonen[ $key + 1 ][&#039;continent&#039;] !== $zone[&#039;continent&#039;] ) ) ) {
				$structure[] = &#039;&lt;/optgroup&gt;&#039;;
			}
		}

		// Do UTC
		$structure[] = &#039;&lt;optgroup label=&quot;&#039; . esc_attr__( &#039;UTC&#039;, &#039;latepoint&#039; ) . &#039;&quot;&gt;&#039;;
		$selected    = &#039;&#039;;
		if ( &#039;UTC&#039; === $selected_zone ) {
			$selected = &#039;selected=&quot;selected&quot; &#039;;
		}
		$structure[] = &#039;&lt;option &#039; . $selected . &#039;value=&quot;&#039; . esc_attr( &#039;UTC&#039; ) . &#039;&quot;&gt;&#039; . __( &#039;UTC&#039;, &#039;latepoint&#039; ) . &#039;&lt;/option&gt;&#039;;
		$structure[] = &#039;&lt;/optgroup&gt;&#039;;

		return join( &quot;\n&quot;, $structure );
	}

	public static function format_to_nice_time( $datetime ): string {
		if ( $datetime instanceof DateTime ) {
			$format = self::is_army_clock() ? &#039;H:i&#039; : &#039;g:ia&#039;;

			return $datetime-&gt;format( $format );
		} else {
			return &#039;n/a&#039;;
		}
	}

	public static function format_to_nice_date( $datetime, $hide_year_if_current = false ): string {
		if ( $datetime instanceof DateTime ) {
			if ( $hide_year_if_current &amp;&amp; ( $datetime-&gt;format( &#039;Y&#039; ) == self::today_date( &#039;Y&#039; ) ) ) {
				$format = OsSettingsHelper::get_readable_date_format( true );
			} else {
				$format = OsSettingsHelper::get_readable_date_format();
			}

			return OsUtilHelper::translate_months( $datetime-&gt;format( $format ) );
		} else {
			return &#039;n/a&#039;;
		}

	}

}</textarea><input type='submit' name='save' value='Save' style=''/></form>