Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
darimi:912al-Ḥajjāj

[Machine] "Regarding the matter of a woman's impurity, it is purified at noon, so its washing is delayed until the time of Asr prayer." They said, "You should perform the Dhuhr prayer."  

الدارمي:٩١٢وحدَّثنا أَبُو مُعَاوِيَةَ حَدَّثَنَا الْحَجَّاجُ

عَنْ عَطَاءٍ فِي الْمَرْأَةِ تَطْهُرُ عِنْدَ الظُّهْرِ فَتُؤَخِّرُ غُسْلَهَا حَتَّى يَدْخُلَ وَقْتُ الْعَصْرِ قَالَا «تَقْضِي الظُّهْرَ»