Is something supposed to happen? Mine just passed but there was no notice or anything like that, I tried the gacha but 100 sq and a dozen tickets with only emiya assassin to show for it . Why did they prevent changing the date if there's no rewards?
Not sure why it is not changeable but it actually does something minor. Almost at the bottom of the servants voice list there are one line that is usually marked with ???, at the selected date it unlocks and the servant mentions something regarding birthdays.
In most cases a congratulation.
I think birthdays are also necessary when attempting to reclaim lost accounts.
Birthday only unlocks special lines. But as said before, it helps to recover your lost account faster.
Happy birthday tho.
