Calculate date differences, add or subtract time, find future or past dates — all with precision.
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Date-Time Calculator
Frequently Asked Questions
How accurate is the date difference calculator? ▼
The calculator uses your browser's built-in Date object which is accurate to the millisecond. It correctly handles leap years, different month lengths, and timezone differences.
Does it account for leap years? ▼
Yes. The JavaScript Date API automatically accounts for leap years (like 2024, 2028). So adding 1 year to Feb 29, 2024 will correctly give you Feb 28, 2025.
What date format does it use? ▼
The date inputs use your browser's native date picker, which adapts to your locale. Results are displayed in a human-readable format (e.g., "15 April 2026").