Time zone in Dynamics Navision 2015

Hi,

We have Nav 2015 instance installed in the server and application is accessed via the Navision 2015 client through the PC.

Lets say,

today is 18/12/2018.

Posting is allowed only till 18/12/2018; which means posting will be blocked by 00.00AM on 19/12/2018.

My time zone is GMT+4.30

If you change the time zone of the Nav client installed PC (not in the Nav server) to a zone which comes behind my origin time zone (Eg: GMT -2.00) and you re-login to the system, system will allow you to post even after 00.00AM on 19/12/2018 because the time of the PC is still of the previous date (May be 10.30PM on 18/12/2018)

And if you check the date of the posted entries, it will 18/12/2018.

Due to some reasons, a team of users are doing this in my company.

Is there anyway control this from the Nav server ?

I cannot control the access in their PCs; they have admin privileges.

Any help will be highly appreciated.

Thanks