unix - 'date -d' not working in my ksh shell -


i need calculate difference between 2 dates , result in hh:ss format.

but problem is, date/shell not support '-d' flag. of articles suggesting '-d' option only. 

input date format = '07-apr-2017 02:19:20'

this equivalent to

date +"%d-%b-%y %h:%m:%s"

when used date -d, getting error "invalid character in date/time specification"

i bet ksh93t+ should support printf '%(fmt)t'.

[step 101] $ echo ${.sh.version} version ajm 93u+ 2012-08-01 [step 102] $ date -d '07-apr-2017 02:19:20' +%s  # gnu date 1491502760 [step 103] $ printf '%(%s)t\n' '07-apr-2017 02:19:20' 1491502760 [step 104] $

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