Dating someone who has the same birthday as you dalila ali rajah dating
So it will be $\approx$ P(Same year) $\times$ P(Same day).So if you had some good estimate of P(Same year), you can calculate the overall probability reasonably well.
If there were 30 people in your relationship then you'd expect two of them to share a birthday but there aren't 30 people, there are only 2.
Suddenly it’s a reminder it’s not just about you because someone else is partying hard on your party day.
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This is analogous to the analyst who performs many post-hoc statistical tests without correcting alpha.
With enough analyses, the probability of finding a significant pattern gets close to one even when alpha is small.