MySQL error code

MySQL error 3912

MySQL server error 3912 is ER_GROUPING_ON_TIMESTAMP_IN_DST, reported with SQLSTATE HY000.

Grouping on temporal is non-deterministic for timezones having DST. Please consider switching to UTC for this query.

Error	3912
Name	ER_GROUPING_ON_TIMESTAMP_IN_DST
SQLSTATE	HY000
Group	Server errors