apply_filters( 'get_post_modified_time', string|int $time, string $format, bool $gmt )
Filters the localized time a post was last modified.
Parameters
- $time
-  (string|int) Formatted date string or Unix timestamp if $formatis 'U' or 'G'.
- $format
-  (string) Format to use for retrieving the time the post was modified. Accepts 'G', 'U', or PHP date format. Default 'U'. 
- $gmt
-  (bool) Whether to retrieve the GMT time. Default false. 
Source
Changelog
| Version | Description | 
|---|---|
| 2.8.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/hooks/get_post_modified_time