A woman's husband died on the 9th of Muharram at noon. Until when does her 'iddah last?

If a woman is pregnant, her 'iddah (waiting period) ends upon delivery, as Allah Almighty says: "And for those who are pregnant, their term is that they deliver their burden." (Surat At-Talaq, 65:4). If she is not pregnant, her 'iddah is four months and ten days, as Allah Almighty says: "And those of you who die and leave wives behind – they, [the wives], shall wait concerning themselves for four months and ten [days]." (Surat Al-Baqarah, 2:234). The 'iddah begins on the day of death. The month of death is counted as a full thirty days, then the following three months are counted by the sighting of the crescent moon. Based on this, the woman completes the remainder of the month of Muharram and adds to it the rest of the 'iddah until it ends on the eighteenth or nineteenth of Jumada al-Ula, depending on the number of days in the month of Muharram.