How to Calculate Days Between Dates

Calculating the number of days between two dates is straightforward. Subtract the start date from the end date to get the total number of days elapsed. Our calculator handles leap years, varying month lengths, and timezone differences automatically.

For example, from January 1 to February 14 is 45 days. The calculator also breaks this down into months and days (1 month, 14 days), hours (1,080), and seconds (3,888,000).

Why Track “Days Since”?

Tracking the number of days since a specific event is a powerful psychological tool. Research shows that maintaining a visible streak creates a strong motivation to keep going — a concept known as the “Seinfeld Strategy” or “don't break the chain.”

• Builds momentum: Each day added to your count reinforces the habit
• Creates accountability: A visible counter makes your progress tangible
• Celebrates milestones: 30 days, 90 days, 1 year — each milestone deserves recognition
• Prevents relapse: The bigger the number, the harder it is to restart from zero

Common Uses for a Day Counter

Frequently Asked Questions