wp_resolve_post_date( string $post_date = '', string $post_date_gmt = '' ): string|false
- Since
- 5.7.0
- Source
wp-includes/post.php:5423
Description
If post_date is not provided, this first checks post_date_gmt if provided, then falls back to use the current time.
For back-compat purposes in wp_insert_post, an empty post_date and an invalid post_date_gmt will continue to return '1970-01-01 00:00:00' rather than false.
Compatibility
- WordPress
- since 5.7.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Parameters
$post_datestringoptional- The date in mysql format (
Y-m-d H:i:s).Default:'' $post_date_gmtstringoptional- The GMT date in mysql format (
Y-m-d H:i:s).Default:''
Return value
string|false- A valid Gregorian-calendar date string, or false on failure.
Performance profile
How much work a call to wp_resolve_post_date() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Moderate
- Scaling
- Constant
- Instructions
- 14–42
- Plugin surface
- None
- Called by
- 2
Reads stored settings via get_option(), cached per request but not free on a cold cache.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 48.
Nothing here hands control to plugin code.
2 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- optionoption read or write
get_option()one call below wp_resolve_post_date() - hookthird-party callbacks
apply_filters()one call below wp_resolve_post_date()
Further down the call graph this can also reach cache, serialize, query and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 6 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_resolve_post_date() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!empty($post_date) && $post_date !== "0000-00-00 00:00:00" | 14–19 | preg_match() |
| always | 19–28 | current_time(), preg_match() |
!empty($post_date_gmt) && $post_date_gmt !== "0000-00-00 00:00:00" | 20–27 | get_date_from_gmt(), preg_match() |
!empty($post_date) && $post_date !== "0000-00-00 00:00:00" && !empty($matches) && is_array($matches) | 33 | preg_match(), wp_checkdate() |
!empty($matches) && is_array($matches) | 38–42 | current_time(), preg_match(), wp_checkdate() |
!empty($post_date_gmt) && $post_date_gmt !== "0000-00-00 00:00:00" && !empty($matches) && is_array($matches) | 39–41 | get_date_from_gmt(), preg_match(), wp_checkdate() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 48 instructions, 14–42 executed per call, 8 branches. The work does not change between versions.
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Uses · 3
- current_time()Retrieves the current time based on specified type.
- get_date_from_gmt()Given a date in UTC or GMT timezone, returns that date in the timezone of the site.
- wp_checkdate()Tests if the supplied date is valid for the Gregorian calendar.
Used by · 2
- wp_insert_post()Inserts or updates a post in the database.
- wp_update_nav_menu_item()Saves the properties of a menu item or create a new one.
Source code
function wp_resolve_post_date( $post_date = '', $post_date_gmt = '' ) { // If the date is empty, set the date to now. if ( empty( $post_date ) || '0000-00-00 00:00:00' === $post_date ) { if ( empty( $post_date_gmt ) || '0000-00-00 00:00:00' === $post_date_gmt ) { $post_date = current_time( 'mysql' ); } else { $post_date = get_date_from_gmt( $post_date_gmt ); } } // Validate the date. preg_match( '/^(\d{4})-(\d{1,2})-(\d{1,2})/', $post_date, $matches ); if ( empty( $matches ) || ! is_array( $matches ) || count( $matches ) < 4 ) { return false; } $valid_date = wp_checkdate( $matches[2], $matches[3], $matches[1], $post_date ); if ( ! $valid_date ) { return false; } return $post_date;}Changelog
Introduced in 5.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
About this page
- Parsed data
- Generated from the wordpress-develop 7.0.4 tag, from
src/wp-includes/post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.