Delaying ghusl for janaabah (impurity following sexual activity) until after dawn has broken in Ramadaan

Is it permissible to delay ghusl for janaabah until after dawn has broken? Is it permissible for women to delay ghusl following the end of menstruation or post-natal bleeding until after dawn has broken?

Praise be to Allaah.

If a woman sees that she has become taahir (pure) before Fajr, then she has to fast, and it does not matter if she delays ghusl until after dawn has broken. But she should not delay it until the sun is risen. The same applies in the case of junub (impurity after sexual activity), one should not delay ghusl until after the sun has risen and in the case of men, they should hasten to do ghusl so that they can pray Fajr with the jamaa’ah (in the mosque).