Date comparison in UNIX

Hi All,
Can some one please suggest me, how to compare the date in unix.
I'm using below command but its not comparing the dates correctly
bankdate=25-JUL-2009
start_date=01-JUL-2009
end_date=31-JUL-2009
echo bankdate="${bankdate}"
echo start_date="${start_date}"
echo end_date="${end_date}"
if (( bankdate >= start_date && bankdate <= end_date ))
then
echo "bank date is in current period"
else
echo "bank date is not in current period"
fi
its giving the below result:
bankdate=25-JUL-2009
start_date=01-JUL-2009
end_date=31-JUL-2009
testp.sh: bankdate: not found
bank date is not in current period
Please suggest me what is wrong in the above...
Thanks in advance,

Hi Reynolds,
Thanks for the reply,
below are the answers for your questions:
#!/bin/bash
{' 'c' 'o' 'd' 'e' '}'
bankdate=25-JUL-2009
start_date=01-JUL-2009
end_date=31-JUL-2009
echo bankdate="${bankdate}"
echo start_date="${start_date}"
echo end_date="${end_date}"
if (( bankdate >= start_date && bankdate <= end_date ))
then
echo "bank date is in current period"
else
echo "bank date is not in current period"
fi
{' 'c' 'o' 'd' 'e' '}'
Output of the above code is
'Output start'
bankdate=25-JUL-2009
start_date=01-JUL-2009
end_date=31-JUL-2009
testp.sh: bankdate: not found
bank date is not in current period
'Output end'
2) your correct i'm using bash.
3) i'm getting the date format from sql session created in the script. If it is very difficult to work with 'DD-MON-YYYY' format i can change it to the other format.
Please suggest me the best solution for this.
Thanks,

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Hello,
i am facing a problem in date comparison
SELECT max(l.id)
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AND l.billing_client_id = 'BHPIF'
AND extract(YEAR FROM l.bill_date) < extract(YEAR FROM to_date('01-Jan-2010', 'dd-Mon-yyyy'))
So when i am using this Query m getting the result ...BUT ...
When i use the Below Query .... i am getting NULL ... So the problem surely is in when comparing with months ..?? how to get ridAre you saying that you're still getting one row of output, but the id on the row is NULL?
SELECT max(l.id)
FROM irf_bill_details l
WHERE to_char(l.agreement_id) = '508814'
AND l.billing_client_id = 'BHPIF'
AND extract(YEAR FROM l.bill_date) < extract(YEAR FROM to_date('01-Jan-2010', 'dd-Mon-yyyy'))
AND extract(MONTH FROM l.bill_date)||'-'||extract(YEAR FROM l.bill_date) < extract(MONTH FROM to_date('01-Jan-2010', 'dd-Mon-yyyy'))||'-'||extract(YEAR FROM to_date('01-Jan-2010', 'dd-Mon-yyyy'))
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Date object values are also just a Long value for the number of milliseconds since Jan 1, 1970 at 00:00:00.000 AM.
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Set today = new Date()Set today = new Date(today.getYear(), today.getMonth(), today.getDate())Set start_date = new Date(2014 - 1900, 2, 6)Set end_date = new Date(2014 - 1900, 2, 14)If (today >= start_date && today <= end_date)     True          Goto Alt ToD     False          Goto ToD
Anthony Holloway
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Date comparison in UNIX

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