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How do I get any date relative to today (in ksh)

How do I get any date relative to today (in ksh)

by  PHV  Posted    (Edited  )
Here a simple ksh function to get any date in the past or in the future from today.
It takes two arguments, the first is mandatory and is the number of days from today (negative for backward) and the second one is optional and is the format you want the date command uses.
Code: 
GetDate(){ # GetDate nDays [format]
  typeset -i nDays=$1; format=$2
  eval $(echo $TZ | sed '
s!\([^-0-9]*\)\([-0-9]*\)\(.*\)!typeset -i localOffset=\2;zon1=\1;zon2=\3!')
  TZ=$zon1$((localOffset-24*nDays))$zon2 date $format
}
#-- Examples:
Code: 
echo "Yesterday: $(GetDate -1)"
echo "Tomorrow: $(GetDate 1)"
echo "Next week: $(GetDate 7 '+%Y-%m-%d')"
#-- Note:
On some *nix flavor the authorized displacement is limited to +/-168 hours and thus the above "Next week" test fails.
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