Who knows the date function algorithm in the database of this system for secondary development of the jieqi novel system?

Who knows the date function algorithm in the database of this system wants to perform secondary development on the jieqi novel system, who knows the date algorithm in the database of this system? the date in the database is analyzed for example 133169146713316914341331691198. The unix timestamp PHPcode wants to perform secondary development on the jieqi novel system, who knows the date function algorithm in this system database?
Who knows the date algorithm in the database of this system for secondary development of the jieqi novel system?
The date in its database, for example, 1331691467 1331691434 1331691198
Analysis

------ Solution --------------------
Unix timestamp

PHP code

$ S = '1970 1331691467 1331691434 '; foreach (explode ('', $ s) as $ v) echo date ('Y-m-d H: I: S ', $ v ).'
';