Calculate date differences, durations, age, business days, countdowns, and timezone conversions instantly. 100% free, no login required.
Our date difference calculator finds the exact number of days, weeks, months, and years between any two dates. It includes a separate count of business days and weekends within your selected range. Exclude public holidays for the US, UK, Canada, or Australia from the count.
Common uses: calculating employee tenure, contract durations, lease expiry, project timelines, or simply finding how many days until an upcoming event. Works for any dates in history or the future — no account or download required.
Add or subtract hours, minutes, and seconds with ease. Ideal for shift workers totaling hours, athletes tracking training, video editors summing clip lengths, and project managers tallying timesheet entries. Eliminates error-prone mental math in the 60-minute-per-hour system.
Computes your precise age in years, months, and days from any date of birth. Also shows total days lived and days until your next birthday. Handles leap year birthdays (Feb 29) correctly. Used for passport & visa age requirements, school admissions, medical records (pediatric age in months), insurance premium milestones, and legal age verification.
Counts Monday–Friday working days between two dates, excluding weekends and public holidays for the United States, United Kingdom, Canada, or Australia. Essential for payroll processing, notice periods, shipping windows, legal filing deadlines, and net-30 payment terms. The key advantage over a regular calendar difference: it correctly skips weekends and holidays that fall within your date range.
Live countdown to any future date and time — updates every second showing days, hours, minutes, and seconds. Works offline, entirely in your browser. Popular for exam dates, product launches, holidays (New Year, Christmas), weddings, and travel departures.
Instantly shows any date and time in major global cities across Tier 1 countries — including New York, Los Angeles, London, Dublin, Frankfurt, Toronto, Vancouver, Sydney, Melbourne, Auckland, Tokyo, and Mumbai. Essential for remote teams scheduling international calls, travelers planning flights, and developers working with UTC timestamps. Correctly accounts for UTC offsets so you never schedule a call at the wrong hour.
Enter a start date and number of days to find your exact project end date. Auto-generates milestone markers at 25%, 50%, and 75% completion. Choose to include or exclude weekends. Used by freelancers setting client delivery dates, development sprints, HR teams calculating probation end dates, and construction managers tracking production schedules.
Exam countdowns and assignment deadlines.
Shift timing and payroll duration.
Employee tenure and notice periods.
Client deadlines and project tracking.
Timezone planning and flight schedules.
Epoch conversion and timestamp math.
Simply enter the start and end dates in our Date Diff tool to get total days, weeks, and business days.
Yes, our Business Days calculator allows you to exclude US federal holidays and weekends.
100% free. We are supported by minimal ads to keep the tools running for everyone.
Yes, click the moon icon in the top right to toggle between light and dark modes.
We use standard Gregorian calendar logic and precise timezone data for all results.
You can copy individual results or use the browser print function for a clean report.
"The best date tool I've used. Clean, fast and incredibly accurate."
"Essential for my payroll calculations every month. Saves me so much time."
"Love the timezone converter for scheduling my global team meetings."