When does the iddah (waiting period) of a deceased woman's husband end, given that her father passed away on the 23rd of Jumada al-Ula at 9:00 PM?

The waiting period (iddah) for a pregnant widow ends upon giving birth. For a non-pregnant widow, her waiting period is four months and ten days. Therefore, the waiting period for the deceased, starting from your father's passing (if she was not pregnant), concludes on the third of Shawwal at 9:00 PM.