Thanks for pointing this out. I have contacted the observer to fix the date for the next frames that will be sent.
At first I thought this was probably a typo or something misconfigured, but discussing this in #satnogs chat channel, @YT2CQ told me that Thai calendar follows the Buddhist Era which is now at the year “2563”.
After I get confirmation from the observer that the issue is fixed I’m going to fix all the timestamps with this issue.
PS There is some active work on documentation these days which will make much easier to find your way through the API. Until then feel free to ask here.