Time offset update for implantable medical devices

A method comprising:

• determining, by processing circuitry, time information for an implantable medical device based on an internal clock of the implantable medical device and a reference time stored in a memory of the implantable medical device;
• controlling, by the processing circuitry, telemetry circuitry to transmit the time information to an external device;
• receiving, by the processing circuitry, from the external device, an offset to the time information;
• storing, by the processing circuitry, the offset in the memory of the implantable medical device;
• and
• controlling, by the processing circuitry, the implantable medical device to deliver therapy according to the time information, the offset, and a therapy program that at least partially defines the therapy.

A system comprising:

• an external device;
• and
• an implantable medical device, the implantable medical device including processing circuitry configured to:
• determine time information for the implantable medical device based on an internal clock of the implantable medical device and a reference time stored in a memory of the implantable medical device;
• control telemetry circuitry to transmit the time information and the offset to the external device;
• receive, from the external device, an offset to the time information;
• store the offset in the memory of the implantable medical device;
• and
• control the implantable medical device to deliver therapy according to the time information, the offset, and a therapy program that at least partially defines the therapy.