2025-12-25, 2025-12-26. Uses your local timezone.
Calculate the exact time between two dates and times, add or subtract any duration, or run a live countdown. This tool supports working-day counts with optional holidays.
Need a quick way to calculate time differences? This online Time Duration Calculator delivers instant results for anything from project deadlines and delivery schedules to study plans and event timers. Enter your start and end date/time to see totals in seconds, minutes, hours, and days, plus a clear human-readable breakdown. Switch to Add/Subtract to move a date forward or backward by years, months, days, hours, minutes, or seconds. Need working days? Exclude weekends and add public holidays to get business-day counts for schedules, contracts, and planning. The built-in Countdown mode is ideal for launches, exams, and reminders. It’s free, accurate, and available anywhere you have internet access.
Q: Does it handle leap years and daylight saving time (DST)?
A: Yes. The calculator automatically accounts for leap years and daylight saving changes when rolling over dates.
Q: How do I count only business days?
A: Select “Exclude weekends” and enter any holidays in YYYY-MM-DD format to skip them from the calculation.
Q: Can I add months or years accurately?
A: Yes. When adding months or years, the tool uses calendar rollovers to ensure accurate results.
Q: Can I share a result with someone else?
A: Yes. Use the Share link option to copy a URL that includes your inputs, so others can view the same result.