D-Day Calculator - Countdown to Important Dates

Calculate days remaining until important dates. Track multiple countdowns for birthdays, weddings, exams, vacations, and more.

Features

• Real-time Countdown - Live countdown to target dates
• Multiple D-Days - Track several countdowns simultaneously
• Past Date Counter - Days since a past event
• Anniversary Tracking - 100-day, 200-day, 1000-day milestones

Popular D-Day Uses

• Wedding countdown
• Birthday countdown
• Exam preparation (SAT, finals)
• Vacation departure
• Project deadlines
• Baby due date

How D-Day Works

D-Day counts down to your target date. D-0 is the target day, D-1 is one day before, D-2 is two days before. After the date passes, it shows D+1, D+2, etc.