you cannot calculate exactly the day moses was born because until the 2nd temple was destroyed the 1st day of the month was set by 2 Witnesses that has seen the moon.
a month has 29.5 days (+ few minutes) so a missing month has 29 days and a full month has 30 days (like this we are counting today) but then the days of the month was set after 2 witnesses came and said they saw the moon and at that day it was "Rosh Hodesh" what means 1st day of the month if after 30 days no witnesses came it was set to 30 days. so you cannot calculate the day exactly because you dont know which months was full or missing until the 2nd temple was destroyed.
but the hebrew day is 7 adar 2368 (3 years after aharon was born)