BROWSE CATEGORY
Date Time tools
Explore date time tools and utilities.
Tools in this category
Date Difference CalculatorCalculate the calendar-day difference between two dates.Age CalculatorCalculate age in years, months, and days from a birth date.Current Unix TimestampView current Unix timestamp in seconds and milliseconds.Time Duration CalculatorCalculate elapsed time between two clock times, including overnight spans.12 Hour to 24 Hour Converter | Military Time Conversion ToolConvert 12-hour time to 24-hour format instantly with our precision converter. Features bulk conversion, seconds support, and military time reference tables.24-Hour to 12-Hour Converter | Precision Military Time ToolConvert 24-hour military time to 12-hour format instantly. Precision-driven interface for AM/PM conversion, bulk processing, and spoken format. High contrast & accessible.Add Days to Date Calculator - Calendar or Business DaysFree online add days to date calculator. Add or subtract calendar days, business days, weeks, months, or years from any date, skip weekends and holidays, and copy the target date. Runs in your browser.Add Months to Date Calculator - Add or Subtract Calendar MonthsUse a free add months to date calculator to add or subtract calendar months, handle month-end dates like January 31, and copy the resulting date.Add Years to Date Calculator - Add or Subtract Calendar YearsUse a free add years to date calculator to add or subtract calendar years, handle February 29 leap-day rules, and copy the resulting date.Free Online Alarm Clock with Snooze, Multiple Alarms & Custom ThemesSet multiple alarms online with snooze, custom sounds, fullscreen themes, live countdowns, and ambient animations. Free browser alarm clock for desktop, iPhone, Android, and tablets.Analog Clock Online Free - Fullscreen, Custom Faces & ThemesFree analog clock online with full screen mode, custom clock faces, Roman numerals and themes, a seconds hand, time zones and a classroom display.Anniversary Calculator - Years, Months & Days TogetherFree anniversary calculator. Find the exact time since a wedding, a first date or any milestone in years, months, days, hours, minutes and seconds, with totals and 1, 5 and 10 year milestone dates. Runs entirely in your browser.Birthday Calculator - Age, Days Lived & Next Birthday CountdownFree online birthday calculator for exact age, days lived, a live next birthday countdown, birthday-year progress, zodiac sign, birthstone, and birth flower. Runs entirely in your browser.Business Days Calculator - Count Business Days Between DatesUse a free business days calculator to count business days between dates, exclude weekends and holidays, customize Saturday or Sunday work, and copy the result.Calendar Generator - Make a Printable Month or Year CalendarFree online calendar generator: build a calendar for any month, quarter, or year, start the week on Sunday or Monday, add ISO week numbers, and print it. Runs entirely in your browser.Countdown Timer Online - Custom Event and Fullscreen TimerUse a free countdown timer online for custom minutes, events, meetings, classes, workouts and fullscreen display with local alarm sounds and no signup.Current Date and Time Now - Live Clock & TimestampSee the current date and time now with live local time, UTC, Unix timestamp, ISO 8601, timezone, and copy-ready formats in your browser.Custom Date Formatter - Pattern, Locale & Time ZoneFree custom date formatter. Build a date format from tokens, pick any of 16 locales and 19 time zones, preview it live, and run the same pattern over a whole pasted list in batch mode. Runs entirely in your browser.Date Format Converter - ISO, Unix & Custom PatternsFree online date format converter. Paste any date string, ISO 8601 value, or Unix timestamp and get it back as a custom pattern, ISO, epoch seconds, RFC 2822, and local or UTC text. Runs entirely in your browser.Date to Roman Numerals Converter - Tattoo & Anniversary DatesFree date to Roman numerals converter for tattoos, anniversaries, weddings, birthdays, jewelry, and inscriptions. Choose DD/MM/YYYY, MM/DD/YYYY, YYYY/MM/DD, separators, and copy instantly.Date to Timestamp Converter - Date & Time to Unix EpochConvert a calendar date and time into a Unix timestamp. Get the epoch value in seconds and milliseconds plus the ISO 8601 string, and choose whether the date is read as local time or UTC. Runs entirely in your browser.Date Validator - Check If A Date String Is RealFree online date validator. Checks any date string against the real calendar, catches February 29 in a non-leap year, explains exactly why a date is invalid, flags ambiguous 01/02/2026 input, and validates a whole pasted list. Runs in your browser.Day of Week Calculator - Find the Weekday for Any DateUse a free day of week calculator to find what weekday any date falls on. Check birthday weekdays, ISO day number, day of year, ISO week and weekend status.Daylight Saving Time Calculator - DST Start and End DatesFind the daylight saving start and end dates for any time zone and any year, with the local time the clocks read on each side of the change, both offsets, the number of days on daylight saving time, and a bar showing the period across the year. Runs entirely in your browser.Deadline Calculator | High-Precision Project & Goal TrackerCalculate exactly how much time remains until your next deadline with precision-first tracking. Includes working days, time zone offsets, and live countdowns.Digital Clock Online - Full Screen Clock with SecondsA precise full-screen digital clock showing the time with seconds, in 12h or 24h format. Dark mode and ambient themes, and it keeps running offline.DST Checker - Is Daylight Saving Time In Effect?Check whether daylight saving time is in effect in any time zone on any date, with the offset in force, the zone's standard offset, and the exact dates and local times its clocks change. Runs entirely in your browser.Epoch Time Converter - Two-Way Unix Epoch & Date ToolConvert epoch time to a date and a date to epoch time in one place. Handles seconds, milliseconds, and microseconds, shows local time and UTC, and keeps a live current epoch clock. Runs entirely in your browser.Event Countdown Timer - Free Shareable CountdownCreate a free event countdown timer with fullscreen display, shareable link, themes, and timezone-aware date tracking. Browser-based, no signup.Exam Countdown Timer - Days Left to Every PaperA free exam countdown timer that counts the days, hours, minutes and seconds to each of your papers. Hold up to eight exams at once, track revision pace per topic, and go fullscreen. Nothing leaves your browser.Fiscal Year Calculator - FY, Quarter & Period FinderFree fiscal year calculator and fiscal quarter finder. Choose a date, fiscal year start month/day, FY naming rule, and get FY label, quarter, week, start/end dates, and progress.Flight Time Calculator - Arrival Time & Time ZonesFree connecting flight time calculator. Enter local departure and arrival times per leg to get layover duration, total journey time, and arrival in local time. Browser-based and private.Holiday Countdown - Days Until Christmas and Every HolidayA free holiday countdown to Christmas, Easter, Thanksgiving, Halloween or a date of your own, in days, hours, minutes and seconds, in any time zone. Every date is worked out from a rule in your browser and nothing is uploaded.ISO Week Date Converter - Week Number to Date ToolUse a free ISO week date converter to convert dates to ISO 8601 week dates, convert ISO week number to date, and check YYYY-Www-D week-year rules.Julian Date Converter - JD, MJD, JDN CalculatorConvert Gregorian dates to Julian Date, Modified Julian Date, Julian Day Number, J2000 days, and ordinal day values. Free browser-based JD calculator.Leap Year Checker - Is This Year a Leap Year?Use a free leap year checker to see if any year is a leap year. Check Gregorian rules, divisible by 4, 100, 400, February 29, next leap year and previous leap year.Local Time to UTC Converter - ISO 8601, Unix and SQLConvert a local wall clock time in any city or IANA time zone into UTC, with ISO 8601, Unix seconds, Unix milliseconds and a SQL datetime, plus a date-shift note and a copyable handoff. Daylight saving applied for the date you choose. Runs entirely in your browser.Meeting Time Planner - Find A Slot Across Time ZonesPlan a meeting across several time zones at once. One row per zone on a shared 24-hour grid, working hours and sleeping hours shaded, a Best slot button, and a schedule you can copy. Runs entirely in your browser.Military Time Converter - 12 to 24 Hour ClockConvert 12-hour time to military time, 24-hour time to standard time, and learn 0000, 1200, 2400, and spoken military formats.Monthly Calendar Generator - Custom Printable Month CalendarFree monthly calendar generator: build a printable calendar for any single month, add your own title, ruled writing lines, week numbers, and weekend shading, then print it from the browser.Moon Phase Calculator | Lunar Age, Illumination & Moon CyclesTrack moon phases, lunar age, illumination percentage, and upcoming full moons for any date. View interactive moon cycles and historical lunar data directly in your browser.New Year Countdown - Days, Hours and Minutes to MidnightA free New Year countdown showing the days, hours, minutes and seconds to midnight in any time zone on Earth, with a year-elapsed bar and five cities crossing New Year one after another. Nothing leaves your browser.Next Birthday Countdown Online - Days Until My BirthdayFree next birthday countdown online. Find how many days until your birthday, live timer, turning age, current age, zodiac sign, leap-day rules, and copyable summary.Online Timer - Run Several Labelled Countdowns at OnceA free online timer that runs several labelled countdowns side by side. Set hours, minutes and seconds, tap a preset, add a minute mid-run, and get a sound alert at zero. Nothing leaves your browser.Overtime Calculator - Time and a Half, Double Time PayUse a free overtime calculator to estimate weekly overtime pay, time and a half, double time, daily overtime, unpaid breaks, and gross hourly earnings.Pay Period Calculator - Payroll Calendar & PaydaysFree pay period calculator for weekly, biweekly, semimonthly, and monthly payroll schedules. Find your next payday, current period, gross pay, and payroll calendar.Period Calculator - Next Period & Fertile WindowFree period calculator to estimate your next period, ovulation date, fertile window, and cycle day. Private browser-based menstrual cycle tool.Pomodoro Timer Online - Maximize Focus & ProductivityFree online Pomodoro Timer with customizable work and break intervals, deep-focus fullscreen mode, session tracking, and daily stats. Runs entirely in your browser.Pregnancy Due Date Calculator - EDD, Weeks & TrimesterFree pregnancy due date calculator. Estimate the due date from your last period, conception date, IVF transfer or an ultrasound scan, and see gestational age, trimester, the 37 to 42 week window and every milestone date. Runs entirely in your browser.Free Printable Calendar PDF Generator - Weekly Monthly YearlyCreate weekly, monthly, and yearly printable calendar PDFs with 16 themes, A4 or Letter sizing, notes, week numbers, and browser-only export.Public Holidays Finder & Global Calendar PlannerDiscover official public holidays instantly with our fast, deterministic Public Holidays Finder. Compare countries, identify long weekends, and export accurate calendars seamlessly.Random Date Generator Online - Pick Dates Between Two DatesGenerate random dates between two dates online. Filter weekdays, include times, create bulk dates, copy CSV, and keep all processing in your browser.Random Time Generator Online - Pick Random Clock TimesGenerate random times online between two times. Pick business hours, overnight ranges, intervals, seconds, 12-hour or 24-hour format, and bulk output.Relationship Duration Calculator - Days Together CounterFree relationship duration calculator and days together counter. Find how long you have been together, total days, next anniversary, and milestones privately in your browser.Count Up Timer Online | Track Time Progress & GoalsCount up timer online to track time and progress toward your goals. Start from zero and watch time increase. Simple, fast, and perfect for productivity tracking.Salary Days Calculator | Accurate Payroll & Working Days ToolCalculate precise salary days, working days, and prorated pay with our free Salary Days Calculator. Exclude weekends and holidays instantly for accurate payroll.Shift Schedule Calculator - Build Work Rosters OnlineCalculate shift schedules online for 2-2-3, 4-on-4-off, 5-on-2-off, day/night/off patterns, total work hours, overtime, and CSV export.Online Stopwatch - Lap Timer with Milliseconds and CSV ExportUse a free online stopwatch with lap times, split times, millisecond precision, keyboard shortcuts, fullscreen mode, copy and CSV export.Subtract Days from Date - Free Date CalculatorSubtract days, weeks, months, years, or business days from any date. Get the past date, weekday, ISO format, and copy-ready result in your browser.Sunrise & Sunset Time Calculator - Twilight & DaylightFree sunrise and sunset time calculator with daylight duration, solar noon, civil twilight, nautical twilight, astronomical twilight, city search, and coordinates.Time Card Calculator - Weekly Hours, Breaks & OvertimeFree time card calculator with lunch breaks, overtime, weekly hours, decimal hours, overnight shifts, estimated gross pay, copy summary, and CSV export.Time Randomizer Tool | Generate Accurate Random TimesUse the Time Randomizer Tool to generate truly uniform random times within custom boundaries. Supports 12/24 hour formats, bulk generation, and interval snapping.Time Slot Generator - Appointment Schedule BuilderGenerate appointment time slots with custom duration, buffers, breaks, 12-hour or 24-hour format, CSV, JSON, and text export. Private browser tool.Time Validator - Check A Time String Is RealFree online time validator. Checks any time string against the 24-hour clock, explains why a value fails, accepts 12-hour, ISO 8601 and compact formats, and enforces your own earliest and latest bounds. Runs entirely in your browser.Time Zone Converter Online - City Time and Meeting PlannerUse a free time zone converter online to convert city time, UTC, EST, PST, IST, GMT and meeting hours with DST-aware browser calculations.Time Zone Difference Calculator - Compare Two Time ZonesFind the exact time difference between any two time zones, with both live clocks, both UTC offsets and an aligned 24-hour strip showing the working-hours overlap. Check any future date. Runs entirely in your browser.Time Zone Offset Finder - UTC and GMT Offset for Any ZoneFind the UTC offset for any IANA time zone on any date, with the GMT offset, the local clock, the UTC equivalent, the abbreviation, and both the standard and daylight offsets the zone uses. Runs entirely in your browser.Timestamp to Date Converter - Unix & Epoch Time to Human DateConvert a Unix timestamp or epoch time to a readable date. Auto-detects seconds, milliseconds, and microseconds, and shows local time, UTC, ISO 8601, the weekday, and how long ago it was. Runs entirely in your browser.Unix Timestamp Converter - Free Epoch Time ToolConvert Unix timestamps to readable dates, ISO 8601, UTC, local time, seconds, milliseconds, and batch results in your browser.UTC to Local Time Converter | High Precision Timezone ToolConvert UTC to local time instantly with smart UTC paste, epoch parsing, IANA timezone selection, local context, and copyable handoff notes.Week Number Calculator - ISO, US and Fiscal Week LookupUse a free week number calculator to find ISO 8601, US, and fiscal week numbers for any date, including current week number and batch date lookup.Work Hours Calculator with Breaks - Free Timesheet ToolCalculate work hours, lunch breaks, decimal hours, overtime, and weekly timesheet totals instantly. Free browser-based tool with no signup.Working Days Calculator - Count Workdays and Exclude HolidaysUse a free working days calculator to count workdays between dates, exclude weekends and holidays, customize Saturday or Sunday work, and copy the result.World Clock Online - Live City Times & UTC OffsetsFree world clock online with an interactive zoomable world map, live city times, 38 UTC offsets, a live day/night terminator, and meeting-friendly time comparisons. Runs entirely in your browser.Yearly Calendar Generator - Printable 12-Month CalendarFree yearly calendar generator: put all twelve months of any year on one printable page, choose two, three, or four columns, add week numbers, and highlight your own dates. Runs in your browser.