In Jain maryada, “second kaal” means the second prahar of daytime.

How to find it

• Take daytime = time from sunrise to sunset.
• Divide it by 4. That gives 1 prahar.
• Second kaal runs from 1 prahar after sunrise up to 2 prahar after sunrise.

Example

• If sunrise is 6:00 and sunset is 18:00 (12 hours daytime), 1 prahar = 3 hours.
• Second kaal = 9:00 to 12:00.
• In monsoon (Chaturmās), boil drinking water within this second‑kaal window and use it in the same day.

Traditions

• Shvetāmbara and Digambara both keep the rule within daytime; exact household maryada can vary by guru‑paramparā. Follow your local acharya’s guidance.

For a simple explanation of “second‑boil/kaal” water validity, see this related note: