I would guess:
This, in Hindi, is
There is ALSO a special character at the beginning which is
This is Dzongkha, as told by the OP, so I looked up
"bhutan birthday", since Dzongkha is the language of Bhutan. More importantly, as told by the OP, it is only used when addressing the King of Bhutan!
And I found the King of Bhutan's birthday is, the answer: