Q: Can the “High Resolution Relative Seconds” VI do a rollover at some point? or will I start losing some precision after a long period of time?

A: According to the LabVIEW Help, you could lose precision over a long period of time: https://www.ni.com/docs/en-US/bundle/labview-api-ref/page/vi-lib/utility/high-resolution-relative-seconds-vi.html. The “Get Date/Time in Seconds” function won't rollover.

Q: Is “High Resolution Relative Seconds” actually more precise than “Get Date/Time in Seconds?” I know time stamps have 64 bits just for fractions of a second vs 64 bits for seconds and fractional.

A: Get date/time in seconds has an absolute reference point, whereas high resolution relative seconds has a drifting reference point. You’ll get better short time delta measurements from high resolution relative seconds, but you’ll get better timestamps for absolute time values from get date/time in seconds.

See also

• Date and Time
• Timed Loops
• Performance
• NI DAQmx hardware