I've done it without issue, it was cool, but after what happened to 23andme I think you should be cautious, consider if you want a company owning that info.
Today is year in 2568 in Thailand - have you heard of the thai-buddhist calendar before? Do you follow any callendars other than gregorian?
The only other calendar where I understand how it actually works is the North Korean calendar that begins when Kim Il Sung was born.
Yum!