When does my mother's 'iddah end in Hijri months, knowing that she passed away on 7/2/2015, and taking into account months with 28, 29, and 30 days?

The waiting period (iddah) for a woman whose husband has died, if she is pregnant, ends upon childbirth. If she is not pregnant, her waiting period is four months and ten days. The waiting period begins from the moment of death. The iddah is calculated by lunar months. If the death occurs during the month, the month must be completed to thirty days. So, if your father passed away on February 7, 2015, corresponding to Rabi' al-Akhir 18, 1436 AH, her waiting period will end on Sha'ban 27 if Rabi' al-Akhir was a full month, otherwise on Sha'ban 28, and the iddah concludes at the same hour of death.