减去13天，然后进行分组：
select time_logged, date_format(start_date - interval 12 day, '%Y-%m') AS `month_logged`from work_loggroup by month_logged;
减去13天，然后进行分组：
select time_logged, date_format(start_date - interval 12 day, '%Y-%m') AS `month_logged`from work_loggroup by month_logged;
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