bash - Invalid date options in Ubuntu -


i have shell script ask system return year, 660days ago. on mac, use this:

date -j -v-660d +"%y"

if run today, return 2011.

i'm moving script ubuntu machine, , receive error, stating -j , -v options invalid.

i've looked @ man page, looking equivalent options, haven't been able find solution.

any appreciated.

this should work:

$ date -d '660 days ago' +%y 2011

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