Cannot set hour and minute at same time

[Redsandro]

I'm using Linux Mint 18 Sarah, which is based on Ubuntu 16.04 LTS, which uses the Ubuntu cron package version 3.0pl1-128ubuntu2.

Expectation:
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11 23 * * 1-5 command

To run command from monday to friday on 11 past 23.

Observation:
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Doesn't run.

* 23 * * 1-5 command # WORKS - every minute at 23 o' clock
11 * * * 1-5 command # WORKS - 11 past every hour
11 23 * * 1-5 command # Does NOT work

Work around:
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Only schedule jobs in the second half hour (e.g. 44 minutes past) is possible using this hack:

*/44 23 * * 1-5 # WORKS

[Redsandro (redsandro)]

Update: It seems that minutes past the half hour are working.

12 23 * * 1-5 command # does not work
45 23 * * 1-5 command # works