Answer

You may have seen both on the same day because in many years the Tithi overlap makes two Jain observances fall on the same civil/calendar day.

In Jain tradition, dates are generally based on the lunar Tithi, not only the sunrise-to-sunrise English date. Because a Tithi can begin and end at different times during a 24-hour day, two related observances may appear on the same day in the printed calendar or in temple practice.

Explanation

This usually happens due to:

• Tithi timing: A Tithi does not always match one full English date.
• Kshaya Tithi: Sometimes a Tithi is “lost” at sunrise and is not counted separately.
• Vruddhi Tithi: Sometimes a Tithi extends over two sunrises.
• Different local Panchangs: Temple calendars may follow local sunrise and regional calculation methods.
• Tradition-based observance: Some Jain festivals or Kalyanaks may be observed according to specific sampradāya rules.

So, over 45 years, it is very possible that you have repeatedly seen both observances listed or celebrated on the same day.

Spiritual Understanding

In Jain Dharma, the deeper focus is not merely the English date, but the bhāv—devotion, reflection, restraint, worship, and remembrance of the sacred event. Calendar calculation helps us observe the right time, but the spiritual intention remains most important.

Takeaway

Seeing both on the same day is not unusual. It is generally due to lunar Tithi calculation and Panchang rules, not a contradiction in Jain Dharma.