Answer

Parna time depends on the specific Jain tapasya, location, sunrise time, tithi, and tradition being followed.

For most Jain fasts, parna is generally done after sunrise on the next day, within the proper parna period prescribed by the local Jain calendar or sangh.

Explanation

To know the correct parna time, please check:

• Your local Jain Panchang
• Your temple or sangh announcement
• Your guru, sadhu-sadhvi bhagwant, or religious guide

Parna time can vary by city because sunrise and tithi timings are different in different places.

Takeaway

Please do parna only during the valid parna time for your location and tapasya. If you tell me your city and which tapasya/fast, I can guide you more specifically.