16 upvas (16 upvās) Jain vrata hai jisme 16 din tak upvas kiya jata hai, yaani pūrṇ upvas ki avdhi hoti hai. Isme din bhar khana na lekar, kuch had tak paani ya sirf boiled paani peene ki maryādā apnāī ja sakti hai (Digambar/Shwetambar ke anusar thodā bhinn hota hai).

• Tivihar upvas: din ke dauran sirf boiled paani ya bhojan ki anumati hoti hai, raat ko paani bhi hota hai.
• Chauvihar upvas: suryaast ke baad na to bhojan, na paani.

16 upvas ko ya to lagatar 16 din ki pankti me kiya ja sakta hai, ya chuni hui tithi par (jaise lunar fortnight ki tithiyan) milakar poora kiya ja sakta hai. Paryushan ya Daśalakṣaṇ jaise parv ke sath milakar 16 ki sankhya poori ki ja sakti hai. Aapke tradition (Digambar ya Shwetambar), aapki jagah/zone, aur kaisi ekta (consecutive ya tithiyan milakar) chuni hai, is par dates alag-alag ho sakti hain.

• Zyada details ke liye padh sakte hain: 16 upvas ki basics, prakār aur prathā ka sankshipt vivaran. You can read more here

Note: Agar aap apni sampradāya (Digambar/Shwetambar), apna shehar/gaon, aur chuni hui 16 tithiyon batayein, to main aapke liye aane wali dates exact list kar sakta/ sakti hoon.