In Jain terminology, kriya (karma) are the actions that bind or shed karma. The phrase you asked about, udayãnantar krutakarma, can be understood as:

• udayãnantar: after udaya, i.e., after sunrise (the period once the sun has risen) or more broadly the day’s early hours after dawn.
• krutakarma: the deeds or actions performed (krta = done, karma).

Putting it together, udayãnantar krutakarma refers to the karmic actions that are performed after sunrise—i.e., the actions of the day that have karmic consequences. In Jain texts, discussions around such time-bound karmas are usually connected with rules of conduct, meditation, and restraint that influence how karma accumulates or gets shed over the course of a day.

Important notes:

• There can be subtle differences in interpretation between Digambar and Shwetambar traditions on exact timing and classification of daily karmas.
• If you want, I can quote the precise verses from Bhagawati Sutra and provide the conventional arth (meaning) as given in each tradition.