Answer

Yes. In the Jain calendar, September 11 and 12, 2027 will have Jain tithis, because every lunar day is a tithi.

However, to tell you the exact Jain tithi for those dates, I would need the Jain Panchang details for your location, because tithi can vary by place and sunrise time.

Explanation

Jain tithi is based on the lunar calendar, not only the English/Gregorian date. The same Gregorian date may have different tithi timing depending on:

• Location
• Sunrise time
• Moon phase calculation
• Local Panchang tradition

Takeaway

Please share your city and country for 11–12 September 2027, and I can help you understand what Jain tithi to check for those dates.