We are reborn...

#!/bin/bash
#PURE BASH
OFFSET=1;
eval `date "+day=%d; month=%m; year=%Y"`
day=`expr $day - $OFFSET`
if [ $day -le 0 ] ;then
month=`expr $month - 1`
if [ $month -eq 0 ] ;then
year=`expr $year - 1`
month=12
fi
set `cal $month $year`
xday=${$#}
day=`expr $xday + $day`
fi
echo $year$month$day"000000"

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