function get_calendar( $initial = true, $echo = true ) {
    global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;
 
    $key   = md5( $m . $monthnum . $year );
    $cache = wp_cache_get( 'get_calendar', 'calendar' );
 
    if ( $cache && is_array( $cache ) && isset( $cache[ $key ] ) ) {
        /** This filter is documented in wp-includes/general-template.php */
        $output = apply_filters( 'get_calendar', $cache[ $key ] );
 
        if ( $echo ) {
            echo $output;
            return;
        }
 
        return $output;
    }
 
    if ( ! is_array( $cache ) ) {
        $cache = array();
    }
 
    // Quick check. If we have no posts at all, abort!
    if ( ! $posts ) {
        $gotsome = $wpdb->get_var( "SELECT 1 as test FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1" );
        if ( ! $gotsome ) {
            $cache[ $key ] = '';
            wp_cache_set( 'get_calendar', $cache, 'calendar' );
            return;
        }
    }
 
    if ( isset( $_GET['w'] ) ) {
        $w = (int) $_GET['w'];
    }
    // week_begins = 0 stands for Sunday
    $week_begins = (int) get_option( 'start_of_week' );
    $ts          = current_time( 'timestamp' );
 
    // Let's figure out when we are
    if ( ! empty( $monthnum ) && ! empty( $year ) ) {
        $thismonth = zeroise( intval( $monthnum ), 2 );
        $thisyear  = (int) $year;
    } elseif ( ! empty( $w ) ) {
        // We need to get the month from MySQL
        $thisyear = (int) substr( $m, 0, 4 );
        //it seems MySQL's weeks disagree with PHP's
        $d         = ( ( $w - 1 ) * 7 ) + 6;
        $thismonth = $wpdb->get_var( "SELECT DATE_FORMAT((DATE_ADD('{$thisyear}0101', INTERVAL $d DAY) ), '%m')" );
    } elseif ( ! empty( $m ) ) {
        $thisyear = (int) substr( $m, 0, 4 );
        if ( strlen( $m ) < 6 ) {
            $thismonth = '01';
        } else {
            $thismonth = zeroise( (int) substr( $m, 4, 2 ), 2 );
        }
    } else {
        $thisyear  = gmdate( 'Y', $ts );
        $thismonth = gmdate( 'm', $ts );
    }
 
    $unixmonth = mktime( 0, 0, 0, $thismonth, 1, $thisyear );
    $last_day  = date( 't', $unixmonth );
 
    // Get the next and previous month and year with at least one post
    $previous = $wpdb->get_row(
        "SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
        FROM $wpdb->posts
        WHERE post_date < '$thisyear-$thismonth-01'
        AND post_type = 'post' AND post_status = 'publish'
            ORDER BY post_date DESC
            LIMIT 1"
    );
    $next     = $wpdb->get_row(
        "SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
        FROM $wpdb->posts
        WHERE post_date > '$thisyear-$thismonth-{$last_day} 23:59:59'
        AND post_type = 'post' AND post_status = 'publish'
            ORDER BY post_date ASC
            LIMIT 1"
    );
 
    /* translators: Calendar caption: 1: month name, 2: 4-digit year */
    $calendar_caption = _x( '%1$s %2$s', 'calendar caption' );
    $calendar_output  = '<table id="wp-calendar">
    <caption>' . sprintf(
        $calendar_caption,
        $wp_locale->get_month( $thismonth ),
        date( 'Y', $unixmonth )
    ) . '</caption>
    <thead>
    <tr>';
 
    $myweek = array();
 
    for ( $wdcount = 0; $wdcount <= 6; $wdcount++ ) {
        $myweek[] = $wp_locale->get_weekday( ( $wdcount + $week_begins ) % 7 );
    }
 
    foreach ( $myweek as $wd ) {
        $day_name         = $initial ? $wp_locale->get_weekday_initial( $wd ) : $wp_locale->get_weekday_abbrev( $wd );
        $wd               = esc_attr( $wd );
        $calendar_output .= "\n\t\t<th scope=\"col\" title=\"$wd\">$day_name</th>";
    }
 
    $calendar_output .= '
    </tr>
    </thead>
 
    <tfoot>
    <tr>';
 
    if ( $previous ) {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="prev"><a href="' . get_month_link( $previous->year, $previous->month ) . '">&laquo; ' .
            $wp_locale->get_month_abbrev( $wp_locale->get_month( $previous->month ) ) .
        '</a></td>';
    } else {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="prev" class="pad">&nbsp;</td>';
    }
 
    $calendar_output .= "\n\t\t" . '<td class="pad">&nbsp;</td>';
 
    if ( $next ) {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="next"><a href="' . get_month_link( $next->year, $next->month ) . '">' .
            $wp_locale->get_month_abbrev( $wp_locale->get_month( $next->month ) ) .
        ' &raquo;</a></td>';
    } else {
        $calendar_output .= "\n\t\t" . '<td colspan="3" id="next" class="pad">&nbsp;</td>';
    }
 
    $calendar_output .= '
    </tr>
    </tfoot>
 
    <tbody>
    <tr>';
 
    $daywithpost = array();
 
    // Get days with posts
    $dayswithposts = $wpdb->get_results(
        "SELECT DISTINCT DAYOFMONTH(post_date)
        FROM $wpdb->posts WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00'
        AND post_type = 'post' AND post_status = 'publish'
        AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59'",
        ARRAY_N
    );
    if ( $dayswithposts ) {
        foreach ( (array) $dayswithposts as $daywith ) {
            $daywithpost[] = $daywith[0];
        }
    }
 
    // See how much we should pad in the beginning
    $pad = calendar_week_mod( date( 'w', $unixmonth ) - $week_begins );
    if ( 0 != $pad ) {
        $calendar_output .= "\n\t\t" . '<td colspan="' . esc_attr( $pad ) . '" class="pad">&nbsp;</td>';
    }
 
    $newrow      = false;
    $daysinmonth = (int) date( 't', $unixmonth );
 
    for ( $day = 1; $day <= $daysinmonth; ++$day ) {
        if ( isset( $newrow ) && $newrow ) {
            $calendar_output .= "\n\t</tr>\n\t<tr>\n\t\t";
        }
        $newrow = false;
 
        if ( $day == gmdate( 'j', $ts ) &&
            $thismonth == gmdate( 'm', $ts ) &&
            $thisyear == gmdate( 'Y', $ts ) ) {
            $calendar_output .= '<td id="today">';
        } else {
            $calendar_output .= '<td>';
        }
 
        if ( in_array( $day, $daywithpost ) ) {
            // any posts today?
            $date_format = date( _x( 'F j, Y', 'daily archives date format' ), strtotime( "{$thisyear}-{$thismonth}-{$day}" ) );
            /* translators: Post calendar label. %s: Date */
            $label            = sprintf( __( 'Posts published on %s' ), $date_format );
            $calendar_output .= sprintf(
                '<a href="%s" aria-label="%s">%s</a>',
                get_day_link( $thisyear, $thismonth, $day ),
                esc_attr( $label ),
                $day
            );
        } else {
            $calendar_output .= $day;
        }
        $calendar_output .= '</td>';
 
        if ( 6 == calendar_week_mod( date( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins ) ) {
            $newrow = true;
        }
    }
 
    $pad = 7 - calendar_week_mod( date( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins );
    if ( $pad != 0 && $pad != 7 ) {
        $calendar_output .= "\n\t\t" . '<td class="pad" colspan="' . esc_attr( $pad ) . '">&nbsp;</td>';
    }
    $calendar_output .= "\n\t</tr>\n\t</tbody>\n\t</table>";
 
    $cache[ $key ] = $calendar_output;
    wp_cache_set( 'get_calendar', $cache, 'calendar' );
 
    if ( $echo ) {
        /**
         * Filters the HTML calendar output.
         *
         * @since 3.0.0
         *
         * @param string $calendar_output HTML output of the calendar.
         */
        echo apply_filters( 'get_calendar', $calendar_output );
        return;
    }
    /** This filter is documented in wp-includes/general-template.php */
    return apply_filters( 'get_calendar', $calendar_output );
}

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Version	Description
1.0.0	Introduced.

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Uses Uses

Uses
Uses	Description
wp-includes/cache.php: wp_cache_get()	Retrieves the cache contents from the cache by key and group.
wp-includes/cache.php: wp_cache_set()	Saves the data to the cache.
wp-includes/l10n.php: _x()	Retrieve translated string with gettext context.
wp-includes/l10n.php: __()	Retrieve the translation of $text.
wp-includes/formatting.php: esc_attr()	Escaping for HTML attributes.
wp-includes/formatting.php: zeroise()	Add leading zeros when necessary.
wp-includes/general-template.php: calendar_week_mod()	Get number of days since the start of the week.
wp-includes/general-template.php: get_calendar	Filters the HTML calendar output.
wp-includes/functions.php: current_time()	Retrieve the current time based on specified type.
wp-includes/class-wp-locale.php: WP_Locale::get_month()	Retrieve the full translated month by month number.
wp-includes/class-wp-locale.php: WP_Locale::get_month_abbrev()	Retrieve translated version of month abbreviation string.
wp-includes/class-wp-locale.php: WP_Locale::get_weekday()	Retrieve the full translated weekday word.
wp-includes/class-wp-locale.php: WP_Locale::get_weekday_initial()	Retrieve the translated weekday initial.
wp-includes/class-wp-locale.php: WP_Locale::get_weekday_abbrev()	Retrieve the translated weekday abbreviation.
wp-includes/link-template.php: get_month_link()	Retrieves the permalink for the month archives with year.
wp-includes/link-template.php: get_day_link()	Retrieves the permalink for the day archives with year and month.
wp-includes/plugin.php: apply_filters()	Call the functions added to a filter hook.
wp-includes/option.php: get_option()	Retrieves an option value based on an option name.
wp-includes/wp-db.php: wpdb::get_var()	Retrieve one variable from the database.
wp-includes/wp-db.php: wpdb::get_row()	Retrieve one row from the database.
wp-includes/wp-db.php: wpdb::get_results()	Retrieve an entire SQL result set from the database (i.e., many rows)

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Used By
Used By	Description
wp-includes/widgets/class-wp-widget-calendar.php: WP_Widget_Calendar::widget()	Outputs the content for the current Calendar widget instance.

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Code Reference

get_calendar( bool $initial = true, bool $echo = true )

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get_calendar( bool $initial = true, bool $echo = true )

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