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Day difference between 2 dates

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# 1  
Old 07-25-2011
Day difference between 2 dates
Hello!
I need to calculate number of days between two dates.
The first date is in format of string.
The second one is in format of date (current date):

Code:
#!/usr/bin/ksh
export ORACLE_HOME=/software/oracle/PROD10gR2
cd /etc/ORACLE/WALLETS/oracle
export EXP_DATE=`. $ORACLE_HOME/bin/orapki cert display -cert  ca64.cer -summary| grep "Valid Until"|cut -f -4`

STRING=$EXP_DATE
STRING=${STRING#???????????????????}
BSTRING=${STRING%????????????????????????}
ESTRING=${STRING#??????????????????????????}
NEW_EXP_DATE=$BSTRING$ESTRING
echo $NEW_EXP_DATE

cur_time=`date +"%h %d %EY"`
last_date=`date -d $NEW_EXP_DATE +"%h %d %EY"`

The last command is failed with error:
date: extra operand `2011'

How can we convert this script to date and then calculate the day difference?

Thank you.
Last edited by radoulov; 07-25-2011 at 10:58 AM.. Reason: Code tags!
# 2  
Old 07-25-2011
Take a look here for date functions, etc...
https://www.unix.com/answers-frequent...rithmetic.html
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