Calculate the equation of time — the difference between apparent solar time and mean solar time — for any date.
Enter your values below
Date to calculate the equation of time for.
How this calculator works
Uses a trigonometric approximation to calculate the difference between sundial time and clock time caused by Earth's orbital eccentricity.
Common questions about this calculator
These calculators are for informational purposes only. While we strive for accuracy, results should not be used as the sole basis for important decisions.
