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current_time( 'mysql' ) returns local site time: 2021-03-04 17:25:47
current_time( 'mysql', 1 ) returns GMT: 2021-03-04 06:25:47
current_time( 'timestamp' ) returns local site time: 2021-03-05 04:25:47
current_time( 'timestamp', 1 ) returns GMT: 2021-03-04 17:25:47