Time & Date Tools
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes from your date of birth. Find out how many days until your next birthday. Free online age calculator.
Countdown Timer
Set a countdown to any future date and time. Displays days, hours, minutes, and seconds remaining. Save your countdown in your browser — no account needed.
Date Calculator
Add or subtract days, weeks, months, or years from any date to find a future or past date. What date is 90 days from today? What was 6 months ago? Free online date calculator.
Day of the Week Calculator
Find out what day of the week any date falls on — past, present, or future. Instantly see the day name, week number, and date details for any date in history.
Days Between Calculator
Calculate the exact number of days between any two dates. Includes weeks, months, and years breakdown. Perfect for planning and date calculations.
Days Until/From Calculator
Calculate what date it will be X days from now or what date it was X days ago. Easy-to-use date calculator with business day options.
Hours Calculator
Calculate the hours and minutes between two times, or add and subtract multiple time durations. Supports 12-hour and 24-hour formats and spans past midnight. Free, instant, browser-based time calculator.
Online Stopwatch
A free online stopwatch with lap time recording, millisecond precision, and a clean lap history table. Works in any browser, no download needed. Start, pause, and reset with a single click.
Overtime Calculator
Calculate regular pay, overtime pay, and total weekly earnings using hourly rate, hours worked, and overtime multipliers.
Pomodoro Timer — Online Study Timer
Use the Pomodoro technique to study smarter. 25-minute focused work sessions followed by short and long breaks. Fully customizable, free, no sign-up.
Presentation and Speech Timer
Free presentation timer for practicing speeches and class presentations. Set a target time, watch color-coded pacing cues as you rehearse, and log your practice run times. No sign-up.
Time Addition Calculator
Free online time addition calculator. Paste in a list of times in hours, minutes, and seconds and instantly get the total. Great for adding up video lengths, work logs, and more.
Time Card Calculator
Calculate total hours worked from daily clock-in and clock-out times. Supports lunch breaks, overtime, and optional hourly wage. Free online time card calculator, no signup required.
Time Zone Converter
Convert times between any two time zones instantly. See what time it is right now in any city or time zone, and convert a specific date and time. Free, no sign-up needed.
Timezone Converter
Convert time between any timezone in the world. Instantly see what time it is in multiple locations for meetings, calls, and scheduling.
Unix Timestamp Converter
Convert Unix timestamps (epoch time) to human-readable dates and times, and convert dates back to Unix timestamps. Supports seconds and milliseconds. Free, runs in your browser.
Work Days Calculator
Count the number of working days between two dates, excluding weekends and optional public holidays. Free business day calculator for deadlines, contracts, and project planning.
More Tools
Time and Date Calculators
These tools handle the everyday date arithmetic that is surprisingly awkward to do by hand — counting days between dates, figuring out how long until an event, calculating someone's exact age, or adding time intervals together.
Days Between Two Dates
The days-between calculator counts the exact number of days separating two calendar dates. Useful for project timelines, contract durations, deadline calculations, and historical date research.
The result can be expressed as total days, or broken down into years, months, and days for a more human-readable interval.
Days Until a Date
Counts down the number of days remaining until a specific date — a deadline, birthday, holiday, event, or personal milestone. The calculation updates based on today's date each time you open the page.
Age Calculator
The age calculator computes a person's exact age in years, months, and days as of today's date (or any comparison date you specify). Useful for legal and administrative contexts where an exact age in days matters, and for anniversary and milestone tracking.
Time Addition Calculator
Adds time intervals (hours, minutes, seconds) together — useful for calculating the total running time of a playlist, the cumulative hours on a timesheet, or the total length of a series of videos or tracks.
Unlike regular addition, time carries at 60 (60 seconds = 1 minute, 60 minutes = 1 hour), which makes manual calculation error-prone. The calculator handles the carries automatically.
Date Arithmetic Reference
- A regular year has 365 days; a leap year has 366.
- Leap years occur in years divisible by 4, except century years (divisible by 100) which are only leap years if also divisible by 400. So 2000 was a leap year; 1900 was not.
- Months have 28–31 days, which is why "1 month" is not a fixed number of days.
- An exact day count is always unambiguous; "months and years" involves interpretation of partial months.
Frequently Asked Questions
- How do I calculate my exact age in days?
- Use the age calculator and select the option to show the result in days, or use the days-between calculator with your date of birth and today's date.
- Does the days-between calculator include both the start and end dates?
- By default the calculation counts the number of days separating the two dates, not including one or both endpoints. If you need to include both ends (as in "the event runs Monday through Friday inclusive"), add 1 to the result.
- How many days until Christmas/New Year/my birthday?
- Use the days-until calculator, enter your target date, and it will display the count from today automatically.