Hi Brenda,

unfortunately there is no such AT-command.

If your intention is to set an RTC on your PIC-board connected to the Phone you could do the following:

as soon as you have received a new SMS-message write your RTC-time to some variables.

now you have got plenty of time to decode the SMS-message.
The message header contains the time it was delivered by the server.
comparing this to your RTCs time gives you the offset you need to correct the RTC.

This is certainly not perfect in terms of accuracy, but far better (+/- 1 min) than the long term accuracy of an RTC with a non-compensated clock.

rgds.