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Is it their conversion date, the Hebrew date on which they were biologically born, or something else? (For questions of halachic age as well as mystical significance)

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    Regarding what does it matter their birthday? Bar/Bat mitzvah? Someone who converts at 11 doesn't have to wait until 24 to be obligated in mitzvos midoraisa – robev Jul 30 '17 at 22:57
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    Seconding @robev What is a "Hebrew Birthday"? Is this some sort of halakhic concept? If its just a day you eat cake. he/she could do so anytime. Please clarify what you mean, to make this answerable. – mevaqesh Jul 30 '17 at 23:02
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    @sah how many concepts depend on age? I can think of very few. – Double AA Jul 31 '17 at 11:52
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    @DoubleAA Maybe if someone pledges his worth to the Temple? 50 vs 15 shekels. – Nic Aug 2 '17 at 19:46
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Dinonline answers,

Although a Ger is considered to be “born anew” when becoming Jewish, this is a halachic concept that relates to family relationship and the like, and it is not a “biological fact.”

The Ger’s birthday thus remains the date that he was physically born on.

Note that there is no actual halachic significance to a person’s birthday, other than determining his age, which is important only for a bar or bat-mitzvah. For this purpose the date of birth is of course the “birthday.”

Interestingly enough, they seem to write in a different answer that the main birthday is when the ger receives his neshama:

Q: When does a ger celebrating his Jewish birthday – on the Jewish date of his birth or on the Jewish date of his giyur? A: He can celebrate both. One day to thank H-shem for giving him his neshoma, and this is surely the main birthday, however he can also celebrate on the day that H-shem gave him his physical body.

  • So, apparently no Bar or Bat Mitzvah, unless the conversion was as a child? (before age 12 or 13) – DanF Jul 30 '17 at 23:21
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    "which is important only for a bar or bat-mitzvah" There's also other potential ages of majority viz-a-viz Aylonit etc. – Double AA Jul 30 '17 at 23:29
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    "which is important only for a bar or bat-mitzvah": perhaps also important for the rule of מפני שיבה תקום? – msh210 Jul 31 '17 at 3:06

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