Calculate precise duration between two dates and times — Get detailed breakdown in days, hours, minutes, seconds & weeks
Calculate project durations, work hours, shift lengths, and overtime periods
Flight durations, trip lengths, timezone differences, and travel time estimates
Days until birthdays, anniversaries, weddings, holidays, or important events
Study session lengths, exam countdowns, semester durations, and assignment deadlines
Workout durations, fasting periods, sleep tracking, and medication schedules
Contract periods, billing cycles, investment durations, and payment deadlines
The calculator converts both dates and times to milliseconds since January 1, 1970 (Unix epoch), subtracts the start from the end, and then breaks down the result into human-readable units: weeks, days, hours, minutes, and seconds.
Our calculator provides accurate results down to the second. It automatically handles different month lengths, leap years, and accounts for all standard calendar variations. Time is calculated in 24-hour format for precision.
Business days are calculated by estimating approximately 5 working days per 7-day week (excluding weekends). This is an approximation and doesn't account for public holidays or specific company working days.
This calculator uses your browser's local timezone for all calculations. For international time differences, ensure you're accounting for timezone offsets in your input times, or use a dedicated timezone calculator.