(no subject)

I've been trying to find out the last time that Rosh Hashanah fell on September 13. It's not easy to get the answer with Google. If I had the time and patience, I might be able to calculate the answer, but the formula is agonizing.

Why do I care? Because September 13 is my sister's birthday. She's 23 now. And keen on embracing her Jewish heritage.

I'd also like to know the last time Rosh Hashanah fell on October 3, my mom's birthday. Since she didn't grow up with Jews, it may have happened in her lifetime without her knowing it.