Sameer recharges his mobile on the circled date with an 84-day plan; it expires exactly 84 days after the recharge date. When does it expire?

$84=12\times 7$, so the weekday stays Tuesday. Date: 20 days left in November, 31 in December and 31 in January use 82 days; 2 more days give 2 February. (1 February takes November as 31 days.)