datetime - Create a bash date/time variable from argument -


given argument being passed in this:

~/documents/checkout/check-out.sh potatoes '2013/05/22 13:43:00'

using 1st or 2nd line, produces 

st=`date --date "$2" +%s`                   # mogul's suggestion st=$(date --date="$2" +%s)                  # kent's suggestion st=$(date --date="2013/05/22 14:45:00" +%s)  date: illegal option -- - usage: date [-jnu] [-d dst] [-r seconds] [-t west] [-v[+|-]val[ymwdhms]] ...      [-f fmt date | [[[mm]dd]hh]mm[[cc]yy][.ss]] [+format]

os x's version of date doesn't understand --date option; need use -f , give format of input date:

st=$(date -j -f "%y/%m/%d %t" "$2" +%s)

for example:

$ date -j -f "%y/%m/%d %t" "2013/05/22 14:45:00" +%s 1369259100

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