https://jira.mariadb.org/browse/MCOL-1775
[MCOL-1775] Addtime/subtime is broken in develop - Jira
broken indevelopjira
https://mariadb.com/docs/server/reference/sql-functions/date-time-functions/addtime
ADDTIME | Server | MariaDB Documentation
Add a time value to a date or time expression. This function sums two time arguments, returning a new time or datetime result.
servermariadbdocumentation