Relative timestamp when real time clock is unavailable

An electronic processing device comprising:

• a processor;
• a network interface configured to communicate with at least one external device;
• a system bus communicatively coupling the network interface and the processor;
• a session clock operably coupled to the processor, the session clock having circuitry that maintains chronological time when the electronic processing device is powered;
• computer readable media communicatively coupled to the processor, the computer readable media storing computer-executable instructions that include an operating system, which when executed by the processor, control operation of the electronic processing device;
• persistent memory operably coupled to the processor, the persistent memory storing at least one timestamp generated when a reference time was not available;
• timestamp logic coupled to the processor and configured to convert timestamps, generated when a reference time was not available, to time of day timestamps once a reference time is acquired via the network interface.