Shell Programming and Scripting

Hi All,

I have two dates: PREVIOUS_DAY and CURRENT_DAY. I need to test the these two values years are same or not.

PREVIOUS_DAY like '%y%m%d' i.e values like 111010, 111011, 111012 etc.

For CURRENT_YEAR:'date +%Y' use this command.
How can derive the year value from PREVIOUS_DAY and o/p value like '+%Y' i.e 2010, 2011 etc.

I am trying PRVIOUS_DAY_YEAR:eval $PREVIOUS_DAY '+%Y' but its not working. Please help me in this regard.

Thanking in advance ........

Regards,
Dathu

The following will help you understand:

Code:

#!/usr/bin/ksh
while true; do
  echo "Enter yymmdd:"
  read mPrev
  if [[ ${mPrev} -le 120101 ]]; then
    echo "Century 21"
    mPrev='20'${mPrev}
  else
    echo "Century 20"
    mPrev='19'${mPrev}
  fi
  echo "mPrev <${mPrev}>"
done