How to get 3 minutes future date?

With GNU date you can do it as simple as this:

date --date="3min"

But busybox seems not so smart (yet). The only reliable solution I came up with using bb is:

busybox date -D '%s' -d "$(( `busybox date +%s`+3*60 ))"

(you don't need the busybox parts if there is no other date implementation present)

If you want a formatted output, you could add this

busybox date -D '%s' +"%y%m%d%H%" -d "$(( `busybox date +%s`+3*60 ))"

Working solution on alpine linux

date -d@"$(( `date +%s`+180))"

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