How to Use the Game Mailbox Reward Expiry Calculator
In mobile and online games, event rewards, login bonuses, and mission rewards sit in your mailbox for a limited time. If you don't claim them before expiry, they're gone permanently. This calculator takes up to 5 reward expiry dates and automatically calculates D-Day countdowns sorted by urgency, so you know exactly what to claim first.
D-0 means expiring today — claim immediately. Positive numbers show days remaining. Expired rewards (negative days) are highlighted in red. Today's date is pre-filled automatically.
D-Day Calculation
D-Day = Expiry Date − Today (in days). D-0 = expires today, positive = days remaining, negative = already expired.
Frequently Asked Questions
Enter the 5 most urgent ones first. Once you've claimed those, re-enter the next batch. The D-Day sorting ensures your most critical rewards appear at the top.
Yes — expired rewards appear in the list marked as "Expired" in red. This helps you identify what you've missed and plan better for future rewards.