#!/bin/bash
MONTH=`date +%m -d "2 month ago"`
CLEAN_YEAR_MONTH=`date +%Y-%m- -d "2 month ago"`
DATE_X_DAY_AGO=`date +%Y-%m-%d -d "5 day ago"`
CLEAN_START_DATE="$CLEAN_YEAR_MONTH""02"
CLEAN_STOP_DATE="$CLEAN_YEAR_MONTH"`date -d "yesterday $MONTH/1 + 1 month - 1 day" "+%d"`

#echo $CLEAN_START_DATE
#echo $CLEAN_STOP_DATE
#echo $DATE_3_DAY_AGO

find  /b1/ -iname '*.bak' -newermt '2019-01-01' ! -newermt "$DATE_X_DAY_AGO" -delete

find /b2/ -iname '*.bak' -newermt "$CLEAN_START_DATE" ! -newermt "$CLEAN_STOP_DATE" -delete