DATE_FROM=`date -d "-1 month -$(($(date +%d)-1)) days" "+%F"`
DATE_TO=`date -d "-$(($(date +%d)-1)) days" "+%F"`
How to get the first day of last month, and the last day of last month in bash
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DATE_FROM=`date -d "-1 month -$(($(date +%d)-1)) days" "+%F"`
DATE_TO=`date -d "-$(($(date +%d)-1)) days" "+%F"`