sh - Parsing string for retrieving date in UNIX and freeBSD -

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i have string in following format: yyyy-mm-dd

how can convert date on unix and freebsd? know is

date -d $var +'%y-%m-%d' on gnu

and

date -jf $var +'%y-%m-%d' on freebsd

but if script (in sh, not in bash) have work on both os? how can combine it?

because date command different kind of solution might if detect correct platform:

#!/bin/sh  var='2014-03-15' platform='uknown' str="$(uname)"  if [ "$str" == 'linux' ];     platform='linux' elif [ "$str" == 'freebsd' ];     platform='freebsd' fi

then according platform can do:

if [ "$platform" == 'linux' ];     date -d "$var" +'%y-%m-%d' elif [ "$platform" == 'freebsd' ];     date -jf "%y-%m-%d" "$var" +'%y-%m-%d' fi

also think missing format command:

date -jf $var +'%y-%m-%d'

i think should be:

date -jf "format" $var +'%y-%m-%d'

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