Debian :: Bash Script Based On Time Of Day

I'm trying to get a bash script to do different things based on the time of day, but at least once a day the test fails:

Code: Select allNOW=$(date +%k%M)
if [[ "$NOW" -ge 1000 ]] && [[ "$NOW" -le 2200 ]];then
        alarm lon
else
        alarm loff
fi

This is the error, and line 59 is the second quoted above:

Code: Select all/home/electrolux/bin/ts.sh: line 59: [[: 059: value too great for base (error token is "059")

The script is run every minute, and this error only occurs at 12:59AM, or 00:59.

I presume the problem is either $NOW is being set to 059, or the testing is seeing 0059 as 059. I think the latter, because for the rest of midnight 'til 00:58 the script works. And with some Googling it seems that the leading 0 is making test treat the number as octal... is there a way to tell it it is decimal?

Perhaps this is just some poor time-testing code? Looking at it I don't think it will cope with set time period that crosses midnight..... there's probably just a command to do what I want, isn't there? I know I could have two different scripts cron'd for the different time periods, but it would be much more preferable to be just the one.