If you do not know it, look to:
Your birth certificate
Your mother, or any prominent figure growing up who knows you
The hospital you were born in, literally. I know, how crazy! — it's really not. You have every right to know your birth details. I promise, you're going to call, say, "Hi, I'm ___, & I'm looking for the time I was born," & they'll be like, "Cool, one sec."
IF NONE OF THESE WORK, PLEASE EITHER TEXT ME @ 708.860.2500 OR EMAIL ME @ SAM@SOWREAPASTROLOGY.COM SO WE CAN DISCUSS A SOLUTION.