Incorrect time in the execution of the Request

Incorrect time in the execution of the Request

The service desk has a working time from 9 am to 18. The SLA urgent plan is configured with an execution time of 1 hour. If an request arrives at 6 pm, the time of its execution is postponed to the next day and is set to 9 am, but must set on 10 am i.e. the engineer must start its execution at 8 am, but this is not working time, and request is considered to be overdue.

Where can I fix this setting?

Time on the server is correct.
Sevice desk:
Our version : 9.3 Build 9301
Data base : postgres

Server service desk Ubuntu 12.04.3 LTS
kernel version 3.8.0 - 29-generic

Thank you.

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