༊जन्मदिनको शुभकामना!
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Sign up to join this communityI would guess:
February 21!
This, in Hindi, is
Happy Birthday.
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:
February 21