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Last 4 numbers of your post number are your birthyear once you are reincarnated.
If there is a + in your ID, add the numbers in your ID together and add that to your new birthyear.
For example, if your post number ends with 5291 and your ID is 6+92HkPj, then add 692 to 5291. Your birthyear will be 5983.
If your ID does not have a +, subtract instead: if post number ends with 5291, and your ID is 6N92PlN/, subtract 692 from 5291. Your birthyear will be 4599.
