Parna (breaking a fast) is done after sunrise, as soon as it is within the prescribed Parna time. The common guideline is to complete Parna within one Muhūrta, which is about 48 minutes after sunrise. Exact timing depends on your local sunrise time and your sangh’s traditions. In short: break the fast after sunrise, ideally within about 48 minutes. ( jainknowledge.com)

If you want a concrete check for tomorrow (Aug 28, 2025), you’ll need to know your local sunrise time and your temple/sangh’s announced Parna window for that day. Common practice is to start with boiled water, then light, simple food, within that 48-minute window. ( jainknowledge.com)

You can read more on Parna timing here and see related guidance on Parna duration here .

Note: If your sangh has announced a specific Parna time for tomorrow, follow that exact window. In both Digambar and Śvētāmbara traditions, the principle is to break the fast after sunrise, within a short, auspicious time. ( jainknowledge.com)