I can't track down an exact date, only that current articles are saying that they recently celebrated their seven year anniversary, due to observations on Jenny's Instagram account, According to Jenny, Sumit doesn't have one.
"Their relationship may have started as a catfish, but Jenny and Sumit are still going strong. The 60-year-old grandmother regularly posts selfies with her 30-year-old fiancé on Instagram and currently lives in Gurgaon, a city two hours outside of Delhi. However, Jenny recently explained to fans that she’s forced to leave India every 180 days because the pair isn’t married yet. The mother of three uses that time to visit her family in California."