Not able to set unix timestamp value when day of month is before 10th

Question

I'm not able to pull in correct partition value when the day of the month is before the 10th. Can someone advise the error in logic where I am assigning value to PARTITION?

NEW=`date +"%Y%m" --date="next month" | sed 's/ *//'`
OLD=`date +"%Y%m" --date="last month" | sed 's/ *//'`
PARTITION=`date --date="+2 month -$(($(date +"%d")-1)) days 00:00:00" +"%s"  | sed 's/ *//'`

The error I get is on the PARTITION declaration:

-bash: 08: value too great for base (error token is "08")

If you are using the `date` from GNU coreutils, then just do `date +"%-d"` instead of `date +"%d"` — M. Nejat Aydin, Feb 08 '21 at 21:41

score 3 · Answer 1 · answered Feb 08 '21 at 21:42

3

k314159's answer is correct. Here is an alternate answer: do not use leading zeros in date's output by specifying %-d instead of %d:

echo $(($(date +"%-d") - 1))

answered Feb 08 '21 at 21:42

xhienne

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score 2 · Accepted Answer · answered Feb 08 '21 at 21:34

The problem occurs in the expression $(($(date +"%d")-1)). The date command returns "08" and Bash (and other shells) treat numbers with a leading zero as octal.

To force decimal representation, precede the number with 10#.

So in your case, use $((10#$(date +"%d")-1)).

Not able to set unix timestamp value when day of month is before 10th

2 Answers2