There are many historical proofs that clearly state that a day begins at sunrise.
The above examples from a diverse group of scholars all point to the same conclusion: historical records and archaeological studies unequivocally demonstrate that the ancient Hebrew Israelites believed that the day began at dawn, just as our Creator intended. Among other detrimental consequences, they adopted a pagan calendar and altered their time reckoning system, which took place during and after their Babylonian captivity.
Every year there are 7 biblical holidays that our Creator made for us to observe, which are harmoniously synchronised to His amazing, prophetic, and unchanging calendar.
Shall we take a look?