apply_filters( ‘get_lastpostmodified’, string|false $lastpostmodified, string $timezone, string $post_type )

Parameters

$lastpostmodifiedstring|false

The most recent time that a post was modified, in ‘Y-m-d H:i:s’ format. False on failure.

$timezonestring

Location to use for getting the post modified date.
See get_lastpostdate() for accepted $timezone values.

More Arguments from get_lastpostdate( … $timezone )

The timezone for the timestamp. Accepts 'server', 'blog', or 'gmt'.
'server' uses the server’s internal timezone.
'blog' uses the post_date field, which proxies to the timezone set for the site.
'gmt' uses the post_date_gmt field.
Default 'server'.

$post_typestring

The post type to check.