How reliable is os.time()

Currently working on a system which requires me to have a extremely accurate co-ordinated clock between servers and I wanted to inquire of os.time() still experiences issues.

I ideally need it within <1 second of accuracy, however I can live with up to 1.5 seconds of accuracy.

If anyone has any information that would be appreciated

I’d imagine that it would be reliable across servers.
Try it and see, if you want to make sure.

You can also try DateTime.now().UnixTimestamp, if you prefer.