Shell script comparing dates - bash

Question

I'm working on a shell script that scrapes a date off a webpage and then checks if it is in the last three days of the current date (running it in Cygwin). If the test passes, it simply echoes "PASS", and if it fails, it echoes "FAIL";
However, when I run my script, I get the following:
integer expression expected: 1317618000
FAIL
Here is the script:
updateStr=$(curl "http://www.mywebsite.com" | grep "Last Update")
dateStr=(`echo $updateStr | sed -e 's/.*Last Update: \([^<]*\)<.*/\1/'`)
update=$(date -d "$dateStr" +%s)
epoch=$(date -d "-3 days ago" +%s)
test "$update" -ge "$epoch" && echo "PASS" || echo "FAIL"
Any ideas on what the issue is?
Edit
Here is the result of running bash -x on the script:
$ bash -x check_date.sh
++ curl http://www.mywebsite.com
++ grep 'Last Update'
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 6542 100 6542 0 0 789 0 0:00:08 0:00:08 --:--:-- 1544
+ updateStr=' <span style="float:right">Last Update: 10/3/2011 2:
'8:45 AM</span></p>
++ echo '<span' 'style="float:right">Last' Update: 10/3/2011 2:58:45 'AM</span><
'p>
++ sed -e 's/.*Last Update: \([^<]*\)<.*/\1/'
' dateStr='(10/3/2011 2:58:45 AM)
' +%ste -d '(10/3/2011 2:58:45 AM)
+ update=$'1317618000\r'
++ date -d '-3 days ago' +%s
+ epoch=$'1317938194\r'
+ test $'1317618000\r' -ge $'1317938194\r'
: integer expression expected1317618000
+ echo FAIL
FAIL
Update
I tried removing the carriage returns that appear in the date outputs, but it's still not working. Here is the updated script:
updateStr=$(curl "http://mywebsite.com" | grep "Last Update")
dateStr=$(echo $updateStr | sed -e 's/.*Last Update: \([^<]*\)<.*/\1/')
update=$(date -d "$dateStr" +%s | tr -d '\r')
epoch=$(date -d "3 days ago" +%s | tr -d '\r')
echo "Last Update: $update"
echo "Epoch Date: $epoch"
test "$update" -ge "$epoch" && echo "PASS" || echo "FAIL"
And here is the result:
$ bash -x ./check_date.sh
++ curl http://mywebsite.com
++ grep 'Last Update'
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 6542 100 6542 0 0 17398 0 --:--:-- --:--:-- --:--:-- 19704
+ updateStr=' <span style="float:right">Last Update: 10/6/2011 2:
'0:02 AM</span></p>
++ echo '<span' 'style="float:right">Last' Update: 10/6/2011 2:40:02 'AM</span><
'p>
++ sed -e 's/.*Last Update: \([^<]*\)<.*/\1/'
' dateStr='10/6/2011 2:40:02 AM
' +%ste -d '10/6/2011 2:40:02 AM
++ tr -d '\r'
+ update=$'1317886802\r'
++ date -d '-3 days ago' +%s
++ tr -d '\r'
+ epoch=$'1318184767\r'
' echo 'Last Update: 1317886802
Last Update: 1317886802
' echo 'Epoch Date: 1318184767
Epoch Date: 1318184767
+ test $'1317886802\r' -ge $'1318184767\r'
: integer expression expected: 1317886802
+ echo FAIL
FAIL

Answer 1

The carriage returns might be in your script itself. Try running dos2unix on your script.

Answer 2

Try this:
update=$(date -d "$dateStr" +%s | tr -d '\r')
epoch=$(date -d "-3 days ago" +%s | tr -d '\r')
That will get rid of the carriage returns at the end of each number, which might help.

Answer 3

bash is determining from context (the presence of '\r' in this case) that these are strings and not integers. The '-ge' binary operator expects integer arguments and so it's throwing an error. Tom Zych's suggestion will work, as well as using string comparison operators, like '<' or '>', which might give unexpected results if the string is badly formatted for some reason. I'm not sure if there is a way to force date to output as an integer or not...
References:
http://tldp.org/LDP/abs/html/untyped.html
http://tldp.org/LDP/abs/html/comparison-ops.html