date | awk '{print $6"_"$3"_"$2"_fw.tar"}'
w//-> get filename like: 2001_8_May_fw.tar

set date:
date -s "11/20/2003 12:48:00"
date -s "12:48"
date -s "11/20/2003"

Then if you want to set the hardware(BIOS) clock so the system will keep the time when it reboots type:
clock -w
or
setclock

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