For Shankheshwar Parshwanath Pooja, the general Jain tradition is:

• Best time: Morning, after completing snan (bath), pratikraman/namokar jap, and other daily shuddhi.
• Alternative: If morning is not possible, you may do the pooja at any time of day when:

- You are clean (snan, clean clothes), - Mind is calm, - Place is shuddh (clean, no disturbances).

• In Shankheshwar Tirth (Gujarat):

The derasar usually opens early morning (around 5:00 am) and pooja/darshan continue till about noon. Exact timings can change with season and local management, so it is best to confirm once with the derasar office or pujari before you go.

Summary:

• Preferred: Morning hours.
• Allowed: Any time in the day with shuddhi and bhakti.
• At Tirth: Early morning to noon; confirm locally for that specific day.

You can read a detailed guidance on this topic here: