Source

File: wp-admin/includes/class-wp-community-events.php

protected function format_event_data_time( $response_body ) {
		if ( isset( $response_body['events'] ) ) {
			foreach ( $response_body['events'] as $key => $event ) {
				$timestamp = strtotime( $event['date'] );

				/*
				 * The `date_format` option is not used because it's important
				 * in this context to keep the day of the week in the formatted date,
				 * so that users can tell at a glance if the event is on a day they
				 * are available, without having to open the link.
				 */
				/* translators: Date format for upcoming events on the dashboard. Include the day of the week. See https://www.php.net/date */
				$formatted_date = date_i18n( __( 'l, M j, Y' ), $timestamp );
				$formatted_time = date_i18n( get_option( 'time_format' ), $timestamp );

				if ( isset( $event['end_date'] ) ) {
					$end_timestamp      = strtotime( $event['end_date'] );
					$formatted_end_date = date_i18n( __( 'l, M j, Y' ), $end_timestamp );

					if ( 'meetup' !== $event['type'] && $formatted_end_date !== $formatted_date ) {
						/* translators: Upcoming events month format. See https://www.php.net/date */
						$start_month = date_i18n( _x( 'F', 'upcoming events month format' ), $timestamp );
						$end_month   = date_i18n( _x( 'F', 'upcoming events month format' ), $end_timestamp );

						if ( $start_month === $end_month ) {
							$formatted_date = sprintf(
								/* translators: Date string for upcoming events. 1: Month, 2: Starting day, 3: Ending day, 4: Year. */
								__( '%1$s %2$d–%3$d, %4$d' ),
								$start_month,
								/* translators: Upcoming events day format. See https://www.php.net/date */
								date_i18n( _x( 'j', 'upcoming events day format' ), $timestamp ),
								date_i18n( _x( 'j', 'upcoming events day format' ), $end_timestamp ),
								/* translators: Upcoming events year format. See https://www.php.net/date */
								date_i18n( _x( 'Y', 'upcoming events year format' ), $timestamp )
							);
						} else {
							$formatted_date = sprintf(
								/* translators: Date string for upcoming events. 1: Starting month, 2: Starting day, 3: Ending month, 4: Ending day, 5: Year. */
								__( '%1$s %2$d – %3$s %4$d, %5$d' ),
								$start_month,
								date_i18n( _x( 'j', 'upcoming events day format' ), $timestamp ),
								$end_month,
								date_i18n( _x( 'j', 'upcoming events day format' ), $end_timestamp ),
								date_i18n( _x( 'Y', 'upcoming events year format' ), $timestamp )
							);
						}

						$formatted_date = wp_maybe_decline_date( $formatted_date, 'F j, Y' );
					}
				}

				$response_body['events'][ $key ]['formatted_date'] = $formatted_date;
				$response_body['events'][ $key ]['formatted_time'] = $formatted_time;
			}
		}

		return $response_body;
	}