I hope that this solution has helped Jhony.
I will send some additional information we found:
The issue may occur at the Azure VM where the site is running the error thrown from the method ConvertFrom tries to calculate the time for the current time zone configured on the Azure VM. In this case the system can`t retrieve the time zone configured on the Virtual machine where the site is running.
If you have configured RDP to the Azure instances login to the instance and configure the time zone settings on the VM and then check if they can be retrieved from Sitefinity after (for example change the time zone on the server).
From my research I am slightly convinced that the timzone had been changed on the VM for Azure that you use with a start up task. You might find this article
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