Choviyar time today is determined by your local sunset. In Jain practice, one finishes eating and drinking before sunset (often about 48 minutes earlier) and then observes chovihar from sunset to the next sunrise. Since you didn’t provide a city, I can’t give an exact minute. Here’s how to find it for your location:

• Find today’s local sunset time for your city.
• Subtract about 48 minutes (one muhurt) to get the latest time to finish food and drink for chovihar.
• Begin observing chovihar at sunset or a few minutes before, continuing until the next day’s sunrise.

This is the standard guidance observed in Jainism, with slight local/temple variations. You can read more here