📆
D-Day Calculator
Calculate the number of days until your target date (D-Day). Past dates are shown as D+.
💡 D-Day is calculated based on today. Future dates are shown as D-, past dates as D+.
📖 How to Use
- Select your target date
- Optionally enter an event name
- Check your D-Day result and remaining/passed days
- View weeks/months and day of the week
✨ Features
- ✓Future date D-Day calculation (D-30, etc.)
- ✓Past date calculation (D+15, etc.)
- ✓Days remaining/passed display
- ✓Weeks/months remaining/passed display
- ✓Target day of week display
- ✓Optional event name
📐 Formula
D-Day = Target Date - Today💡 How It Works
- •D-Day originally meant 'Designated Day' in military terminology. Now it's widely used to mark important dates.
- •D-Day is the target day, D-1 is one day before, D-30 is 30 days before.
- •D+1 is one day after, D+30 is 30 days after the target date.
- •Weeks are calculated by dividing days by 7, months by 30.
- •Month calculation is approximate since months have different numbers of days.
❓ FAQ
Q. What does D-Day mean?
A. D-Day stands for 'Designated Day' and refers to an important target date or operation start date.
Q. What's the difference between D-1 and D+1?
A. D-1 is one day before the target, D+1 is one day after. The target day itself is D-Day or D-0.
Q. Can I calculate past dates?
A. Yes, entering a past date shows D+ format indicating how many days have passed.
Q. Are week/month calculations accurate?
A. Weeks are accurate (7 days). Months are approximate (30 days) since months vary in length.