[Pharo-project] System time

I am developing a time sensitive application. I poll a server every minute for new data. The data is time sensitive and the sooner I can get the data to the release of the data the better. I have noticed that Pharo's system time drifts away from the OS system time. I would really like the Pharo system time to be the correct time. I have not been able to find where in Pharo I can call to update the System clock to the correct time. Any help greatly appreciated. Jimmie