Source

File: wp-includes/class-wp-locale.php

public function init() {
		// The weekdays.
		$this->weekday[0] = /* translators: Weekday. */ __( 'Sunday' );
		$this->weekday[1] = /* translators: Weekday. */ __( 'Monday' );
		$this->weekday[2] = /* translators: Weekday. */ __( 'Tuesday' );
		$this->weekday[3] = /* translators: Weekday. */ __( 'Wednesday' );
		$this->weekday[4] = /* translators: Weekday. */ __( 'Thursday' );
		$this->weekday[5] = /* translators: Weekday. */ __( 'Friday' );
		$this->weekday[6] = /* translators: Weekday. */ __( 'Saturday' );

		// The first letter of each day.
		$this->weekday_initial[ __( 'Sunday' ) ]    = /* translators: One-letter abbreviation of the weekday. */ _x( 'S', 'Sunday initial' );
		$this->weekday_initial[ __( 'Monday' ) ]    = /* translators: One-letter abbreviation of the weekday. */ _x( 'M', 'Monday initial' );
		$this->weekday_initial[ __( 'Tuesday' ) ]   = /* translators: One-letter abbreviation of the weekday. */ _x( 'T', 'Tuesday initial' );
		$this->weekday_initial[ __( 'Wednesday' ) ] = /* translators: One-letter abbreviation of the weekday. */ _x( 'W', 'Wednesday initial' );
		$this->weekday_initial[ __( 'Thursday' ) ]  = /* translators: One-letter abbreviation of the weekday. */ _x( 'T', 'Thursday initial' );
		$this->weekday_initial[ __( 'Friday' ) ]    = /* translators: One-letter abbreviation of the weekday. */ _x( 'F', 'Friday initial' );
		$this->weekday_initial[ __( 'Saturday' ) ]  = /* translators: One-letter abbreviation of the weekday. */ _x( 'S', 'Saturday initial' );

		// Abbreviations for each day.
		$this->weekday_abbrev[ __( 'Sunday' ) ]    = /* translators: Three-letter abbreviation of the weekday. */ __( 'Sun' );
		$this->weekday_abbrev[ __( 'Monday' ) ]    = /* translators: Ttree-letter abbreviation of the weekday. */ __( 'Mon' );
		$this->weekday_abbrev[ __( 'Tuesday' ) ]   = /* translators: Three-letter abbreviation of the weekday. */ __( 'Tue' );
		$this->weekday_abbrev[ __( 'Wednesday' ) ] = /* translators: Three-letter abbreviation of the weekday. */ __( 'Wed' );
		$this->weekday_abbrev[ __( 'Thursday' ) ]  = /* translators: Three-letter abbreviation of the weekday. */ __( 'Thu' );
		$this->weekday_abbrev[ __( 'Friday' ) ]    = /* translators: Three-letter abbreviation of the weekday. */ __( 'Fri' );
		$this->weekday_abbrev[ __( 'Saturday' ) ]  = /* translators: Three-letter abbreviation of the weekday. */ __( 'Sat' );

		// The months.
		$this->month['01'] = /* translators: Month name. */ __( 'January' );
		$this->month['02'] = /* translators: Month name. */ __( 'February' );
		$this->month['03'] = /* translators: Month name. */ __( 'March' );
		$this->month['04'] = /* translators: Month name. */ __( 'April' );
		$this->month['05'] = /* translators: Month name. */ __( 'May' );
		$this->month['06'] = /* translators: Month name. */ __( 'June' );
		$this->month['07'] = /* translators: Month name. */ __( 'July' );
		$this->month['08'] = /* translators: Month name. */ __( 'August' );
		$this->month['09'] = /* translators: Month name. */ __( 'September' );
		$this->month['10'] = /* translators: Month name. */ __( 'October' );
		$this->month['11'] = /* translators: Month name. */ __( 'November' );
		$this->month['12'] = /* translators: Month name. */ __( 'December' );

		// The months, genitive.
		$this->month_genitive['01'] = /* translators: Month name, genitive. */ _x( 'January', 'genitive' );
		$this->month_genitive['02'] = /* translators: Month name, genitive. */ _x( 'February', 'genitive' );
		$this->month_genitive['03'] = /* translators: Month name, genitive. */ _x( 'March', 'genitive' );
		$this->month_genitive['04'] = /* translators: Month name, genitive. */ _x( 'April', 'genitive' );
		$this->month_genitive['05'] = /* translators: Month name, genitive. */ _x( 'May', 'genitive' );
		$this->month_genitive['06'] = /* translators: Month name, genitive. */ _x( 'June', 'genitive' );
		$this->month_genitive['07'] = /* translators: Month name, genitive. */ _x( 'July', 'genitive' );
		$this->month_genitive['08'] = /* translators: Month name, genitive. */ _x( 'August', 'genitive' );
		$this->month_genitive['09'] = /* translators: Month name, genitive. */ _x( 'September', 'genitive' );
		$this->month_genitive['10'] = /* translators: Month name, genitive. */ _x( 'October', 'genitive' );
		$this->month_genitive['11'] = /* translators: Month name, genitive. */ _x( 'November', 'genitive' );
		$this->month_genitive['12'] = /* translators: Month name, genitive. */ _x( 'December', 'genitive' );

		// Abbreviations for each month.
		$this->month_abbrev[ __( 'January' ) ]   = /* translators: Three-letter abbreviation of the month. */ _x( 'Jan', 'January abbreviation' );
		$this->month_abbrev[ __( 'February' ) ]  = /* translators: Three-letter abbreviation of the month. */ _x( 'Feb', 'February abbreviation' );
		$this->month_abbrev[ __( 'March' ) ]     = /* translators: Three-letter abbreviation of the month. */ _x( 'Mar', 'March abbreviation' );
		$this->month_abbrev[ __( 'April' ) ]     = /* translators: Three-letter abbreviation of the month. */ _x( 'Apr', 'April abbreviation' );
		$this->month_abbrev[ __( 'May' ) ]       = /* translators: Three-letter abbreviation of the month. */ _x( 'May', 'May abbreviation' );
		$this->month_abbrev[ __( 'June' ) ]      = /* translators: Three-letter abbreviation of the month. */ _x( 'Jun', 'June abbreviation' );
		$this->month_abbrev[ __( 'July' ) ]      = /* translators: Three-letter abbreviation of the month. */ _x( 'Jul', 'July abbreviation' );
		$this->month_abbrev[ __( 'August' ) ]    = /* translators: Three-letter abbreviation of the month. */ _x( 'Aug', 'August abbreviation' );
		$this->month_abbrev[ __( 'September' ) ] = /* translators: Three-letter abbreviation of the month. */ _x( 'Sep', 'September abbreviation' );
		$this->month_abbrev[ __( 'October' ) ]   = /* translators: Three-letter abbreviation of the month. */ _x( 'Oct', 'October abbreviation' );
		$this->month_abbrev[ __( 'November' ) ]  = /* translators: Three-letter abbreviation of the month. */ _x( 'Nov', 'November abbreviation' );
		$this->month_abbrev[ __( 'December' ) ]  = /* translators: Three-letter abbreviation of the month. */ _x( 'Dec', 'December abbreviation' );

		// The meridiems.
		$this->meridiem['am'] = __( 'am' );
		$this->meridiem['pm'] = __( 'pm' );
		$this->meridiem['AM'] = __( 'AM' );
		$this->meridiem['PM'] = __( 'PM' );

		// Numbers formatting.
		// See https://www.php.net/number_format

		/* translators: $thousands_sep argument for https://www.php.net/number_format, default is ',' */
		$thousands_sep = __( 'number_format_thousands_sep' );

		// Replace space with a non-breaking space to avoid wrapping.
		$thousands_sep = str_replace( ' ', ' ', $thousands_sep );

		$this->number_format['thousands_sep'] = ( 'number_format_thousands_sep' === $thousands_sep ) ? ',' : $thousands_sep;

		/* translators: $dec_point argument for https://www.php.net/number_format, default is '.' */
		$decimal_point = __( 'number_format_decimal_point' );

		$this->number_format['decimal_point'] = ( 'number_format_decimal_point' === $decimal_point ) ? '.' : $decimal_point;

		// Set text direction.
		if ( isset( $GLOBALS['text_direction'] ) ) {
			$this->text_direction = $GLOBALS['text_direction'];

			/* translators: 'rtl' or 'ltr'. This sets the text direction for WordPress. */
		} elseif ( 'rtl' === _x( 'ltr', 'text direction' ) ) {
			$this->text_direction = 'rtl';
		}
	}