Sourabh_13
TF Ace
Amazon Prime Membership (M1): currently active, ends on 17/07/2025
Amazon Prime Membership Vouchers (V_{old}): xyz is the expiry date.
Statement 1: M1 has been never extended using any voucher V.
Statement 2: You extented M1 using V_{old} before M1 ended. --> Now M1 cannot be extended again. --> You cannot use any V to extend M1 before 17/07/2025.
M2: Not yet active, starts on 18/07/2025 and ends on 17/07/2026.
Lets travel to the future...to any date between 18/07/2025 and 17/07/2026.
Lets say we are on the day 20/07/2026.
Statement 3: M2 is active, ends on 17/07/2026.
Statement 4: M2 is never extended since it's became active.
--> M2 can be extended once during it's tenure.
--> M2 can be extended once during 18/07/2025 to 17/07/2026.
Statement 5: Voucher V_{csb} from CSB has expiry date of 08/07/2026.
--> V_{csb} can be / has to be used before 08/07/2026 to start a new membership or extend an unextended membership.
--> You can and should use V_{csb} to extend M2 during 18/07/2025 to 08/07/2026.
