Bug 244977

Customer has set the variable DAILY_TIME="00:15" in /etc/sysconfig/cron.
According to the documentation this should execute cron.daily at 00:15.

But the customer noticed that now cron daily was run twice, on 00:00 and 00:15.
Investigating this he found a bug in:  /usr/lib/cron/run-crons.
The row:

DAILY_TIME_NEW="`echo $DAILY_TIME | sed s,:,, | sed s,^0,, `"

will remove the colon and the first zero from the value in DAILY_TIME and hence put 015 into DAILY_TIME_NEW.
This is then evaluated in:

[ $(($DAILY_TIME_NEW - 15)) -lt "$NOW_H" ] && [ $(($DAILY_TIME_NEW  + 15)) -gt "$NOW_H" ]

According to the bash manpage (ARITHMETIC EVALUATION):

        Constants  with  a  leading  0  are  interpreted as octal numbers.

Hence 015 is evaluated octal which gives 5 times 8 power of 0 plus 1 time 8 power of 1 equals 5+8=13.
For 13, the comparison above is true for both NOW_H=0 and NOW_H=15.

I guess it is not intended that the value in DAILY_TIME gets evaluated octal.
A fix therefore is simple.
Just remove all leading zeroes from DAILY_TIME in order to let it evaluate decimal, e.g.:

DAILY_TIME_NEW="`echo $DAILY_TIME | sed s,:,, | sed s,^0*,, `"