Date & Time
Work with dates and times: age, date differences, business days, durations, time zones and countdowns.
Add Business Days Calculator
Add or subtract working days from a date, skipping weekends and any holidays you list. See the result date and its day of the week instantly.
Add Days Calculator
Add or subtract calendar days from any date and see the result with its day of the week. Free, instant and works for past or future dates.
Add Time Calculator
Add or subtract hours and minutes from a time of day. See the new clock time and whether it crosses into another day. Free and private.
Add to Date
Add or subtract days, weeks, months and years from any date and get the new date. Handles month-end and leap days correctly. Free and instant.
Age Calculator
Calculate your exact age in years, months and days from your date of birth. See your age in total days, weeks and months too. Free and private.
Age Difference Calculator
Find the age gap between two birthdates in years, months and days, plus the total day count. Free, private and works for any pair of dates.
Business Days Calculator
Count working days between two dates or add business days to a date. Skips weekends and any holidays you list. Inclusive counting, instant results.
Countdown Timer
Free online countdown timer. Count down to a target date and time, or run a duration like 25m or 1h 30m. Big live display, presets, and sound.
Countdown Timer
Free live countdown timer to any date and time. Set a target and watch the days, hours, minutes and seconds tick down in real time.
Date Add/Subtract Calculator
Add or subtract years, months, weeks and days from any date. Get the exact result date and weekday, with smart end-of-month clamping.
Date Difference Calculator
Find the number of days, weeks, business days and years, months and days between two dates. Enter a start and end date to see the full breakdown.
Date to Words
Write any date in words, like June 11th, 2026 or 11 June 2026. Choose month-day-year or day-month-year order, ordinals, and long or short months.
Day of the Week Calculator
Find out what day of the week any date falls on, from past to future. See the weekday name and whether it lands on a weekend. Free and instant.
Day of the Year Calculator
Find which numbered day of the year a date is, from 1 to 366, plus how many days are left. Handles leap years and Feb 29. Free and private.
Days in Month Calculator
Find how many days are in any month and year. February is leap-year aware, and the result names the weekday the 1st lands on. Free, fast, and accurate.
Days Until Calculator
Count how many days until a future date, or how many days since a past one. See the total in days and as weeks plus leftover days. Free and instant.
Days Until Date
Count the days from today, or any start date, until a target date, with a weeks and days breakdown. Works for past dates too. Free and instant.
Days Until Date Calculator
Count the days until any date. Enter a target date to see how many days, weeks, months and business days are left, with a from date that defaults to today.
Epoch Batch Converter
Convert many Unix epoch timestamps to UTC dates, or dates to epochs, in one paste. Handles seconds and milliseconds, flags bad lines, exports CSV.
ISO Week Calculator
Find the ISO 8601 week number for any date, with the matching ISO year and weekday. Convert a week number back to a date too. Free and standards-correct.
Leap Year Calculator
Check if any year is a leap year, see how many days it has, and find the next and previous leap years. Uses the full Gregorian rule. Free and instant.
Meeting Planner Across Time Zones
Find a meeting time that works for everyone. Add each person's UTC offset and working hours to see the overlapping window in their local time and in UTC.
Meeting Time Zone Planner
See one meeting time across multiple time zones at once, with the local hour, date and working-hour overlap for each city. Free and private.
Months Between Calculator
Count the calendar months and leftover days between two dates. See the total months and a years, months and days breakdown. Free, private and instant.
Moon Phase Calculator
Find the moon phase for any date. See the phase name, moon age in days, and percent illuminated, computed with the standard synodic method. Free and instant.
Next Weekday Calculator
Find the next Monday, Friday, or any weekday from a given date. Returns one or more upcoming dates, optionally including the start date. Free and exact.
Pomodoro Timer
A free online Pomodoro timer. Run 25 minute focus sessions with short and long breaks, count your pomodoros, and set custom times. Private, in your browser.
Quarter Calculator
Find which quarter a date falls in, Q1 to Q4, with the exact start and end months. Supports calendar and fiscal years. Free and private.
Recurring Date Generator
Generate a list of recurring dates from a start date. Pick daily, weekly, monthly or yearly, set the interval and count, then copy or download.
Roman Numeral Date Converter
Write any date in Roman numerals for tattoos, anniversaries and cornerstones. Pick the day, month and year, choose the order, then copy the result.
Sprint Date Calculator
Generate a full agile sprint schedule from a start date. Set sprint length, count and gaps to get start, end and working days for every sprint.
Stopwatch
Free online stopwatch with start, stop, resume, lap and reset. Times to a hundredth of a second, records splits and highlights your fastest and slowest laps.
Sunrise Sunset Calculator
Find sunrise, sunset, solar noon, day length, twilight and golden hour for any latitude, longitude and date. Handles the midnight sun and polar night.
Time Ago Formatter
Turn a date or timestamp into relative time like 3 hours ago or in 2 days. Picks the largest unit from minutes to years, with past and future support.
Time Difference Calculator
Find the duration between two clock times in hours and minutes. Handle overnight spans that cross midnight with one toggle. Free, instant, and exact.
Time Duration Calculator
Find the duration between two times of day. Enter a start and end time to get hours and minutes, total minutes and decimal hours, including overnight shifts.
Time Zone Converter
Convert a date and time from one time zone to another. Pick any two IANA zones and see the converted time with UTC offsets. Handles DST automatically.
Week Number Calculator
Find the ISO 8601 week number for any date, plus the day of the year, weekday, calendar quarter and how many days are left in the year.
Weeks Between Calculator
Count the weeks between two dates. See the total days, the decimal number of weeks, and whole weeks plus leftover days. Free, private and instant.
Working Days With Holidays
Count working days between two dates while excluding your own holidays. Set custom weekend days and see a full breakdown of weekends and holidays.
Zodiac Sign Calculator
Find your western zodiac sign from your birth date. Enter the month and day to see your star sign, its element, date range and key traits. Free and private.