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I am on SunOS machine trying to get the date string of the past minute, yesterday I used this command I found on the internet

expr `date +%Y%m%d%k%M` - 1

which is worked just fine and I saw the output and this is the output I got from my session that is still opened:

bash-3.00$ expr `date +%Y%m%d%k%M` - 1 201303131641

Now I am trying to run this command on the same session and I got this output:

bash-3.00$ expr `date +%Y%m%d%k%M` - 1 expr: syntax error

My machine is running this OS:

bash-3.00$ uname -a SunOS mySunOS 5.10 Generic_144488-11 sun4v sparc SUNW,Netra-T2000

I think there is some environmental variable or something that have been changed, can anyone help me out with this?

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Try %H instead of %k. Yesterday it probably worked because the hour had double digits then. Note that this is not a good way to get the previous minute, because of what happens when the time is exactly on the hour.

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