WebToolArcPopular Date & Time workflows
Direct links to four high-demand tools in this category.
Date & Time
Date arithmetic, clock durations and unit conversion now surface the assumptions that most often cause scheduling mistakes.
Start with the eight flagship timers
Use the direct workflow that matches the job: countdown, stopwatch, local alarm, focus cycle, intervals, presentations or classroom timing. All eight run in the browser and link into the wider Date & Time specialist family.
Choose calendar vs duration → calculate → verify assumptions → reuse
Date arithmetic, clock durations and unit conversion now surface the assumptions that most often cause scheduling mistakes.
Calendar dates & differences
Work with calendar-aware days, months, years, weekdays and business dates.
Clocks, timers & elapsed time
Use live clocks/timers for running sessions and duration calculators for fixed start/end arithmetic.
Time representation & planning
Convert units or representations, inspect week/day numbering, or move into time-zone planning.
All Date & Time
Age Calculator
Calculate exact age in calendar years, months, and days from a date of birth, plus total days and weeks and time until the next birthday.
Date & TimeDate Calculator
Add or subtract days, weeks, months, or years from a date, or calculate the difference between two dates with optional calendar rules.
Date & TimeDay Counter
Count the number of days between two calendar dates.
Date & TimeBusiness Days Calculator
Count weekdays between two dates.
Date & TimeTime Calculator
Add or subtract a fixed duration from a clock time, or combine two durations, with seconds, day rollover, 12/24-hour output, quick presets, copy, and recent calculations.
Date & TimeTime Duration Calculator
Calculate elapsed time between two clock times or two local date-times with seconds, overnight handling, decimal totals, swap, presets, and copy-ready results.
Date & TimeCountdown Timer
Run a fast visual countdown with presets, repeat mode, shared saved durations, progress and end-time context, fullscreen, sound controls, and keyboard shortcuts.
Date & TimeHours Calculator
Calculate worked hours between two clock times with optional break deduction, overnight handling, time-clock rounding, decimal hours, and copy-ready results.
Date & TimeTime Card Calculator
Build a reusable weekly time card with daily start/end times, break deductions, total hours, overtime planning, estimated gross pay, CSV export, print, and browser-local restore.
Date & TimeDays From Today Calculator
Calculate a date a chosen number of days from today.
Date & TimeOnline Stopwatch
Run a clean online stopwatch with a large elapsed-time display, one-tap start/pause, laps, keyboard shortcuts, and fullscreen mode.
Date & TimeMinutes to Hours Converter
Convert minutes to decimal hours and hours/minutes.
Date & TimeHours to Minutes Converter
Convert hours to minutes instantly.
Date & TimeSeconds to Minutes Converter
Convert seconds to minutes and seconds.
Date & TimeWeeks Between Dates Calculator
Find full weeks and remaining days between two calendar dates, with total days, exact weeks, weekday/weekend context, and clear boundary rules.
Date & TimeMonths Between Dates Calculator
Find complete calendar months and remaining days between two dates, with a calendar breakdown, total days, weeks, and an average-month comparison.
Date & TimeWeekday Calculator
Find the day of the week for any calendar date.
Date & TimeToday’s Date
Show today’s date in several common formats.
Date & TimeOnline Timer
Run a browser countdown timer with quick presets, custom hours/minutes/seconds, a large display, alarm choices, keyboard-friendly controls, and fullscreen.
Date & TimeDate Countdown Calculator
Count down the days, hours, and minutes to a future date.
Date & TimeTime Zone Converter
Convert a local date and time between time zones with UTC offsets, daylight-saving handling, swap controls, and optional multi-zone comparison.
Date & TimeDay of Year Calculator
Find the day number within the year for any date.
Date & TimeWeek Number Calculator
Find the ISO week number for a calendar date.
Date & TimeLeap Year Calculator
Check whether a year is a leap year.
Date & TimeTime to Decimal Converter
Convert hours and minutes to decimal hours.
Date & TimeDecimal to Time Converter
Convert decimal hours to hours and minutes.
Date & TimeDays in Month Calculator
Find the number of days in any month and year.
Date & TimeOnline Alarm Clock
Set a reliable single browser alarm with label, volume, test sound, configurable snooze, fullscreen clock, persistence, and a live next-alarm countdown.
Date & TimeWorld Clock
See saved live clocks before setup controls, then add, search, sort, reorder, copy, and save the zones you actually use.
Date & TimeMinutes to Seconds Converter
Convert minutes to seconds instantly.
Date & TimeSeconds to Hours Converter
Convert seconds to hours instantly.
Date & TimeHours to Seconds Converter
Convert hours to seconds instantly.
Date & TimeDays to Hours Converter
Convert days to hours instantly.
Date & TimeYears Between Dates Calculator
Find completed calendar years, remaining months and days, total months, days, weeks, and a decimal-year comparison between two dates.
Date & TimeMonths From Date Calculator
Add or subtract months from a date.
Date & TimeYear Calendar
View a full printable 12-month calendar for any year.
Date & TimePomodoro Timer
Run a visually dominant focus timer with quick 25/5, 50/10, and 15/3 presets, task context, session tracking, keyboard control, and fullscreen.
Date & TimeOnline Analog Clock
View a clean live analog clock with seconds, digital time, date, and fullscreen mode.
Date & TimeClock with Seconds
Show a large live digital clock with seconds or milliseconds for local time, UTC, or browser-supported world time zones.
Date & TimeSleep Calculator
Estimate bedtime or wake-up times from a customizable sleep-cycle length and time to fall asleep.
Date & TimeMoon Phase Calculator
Estimate the Moon phase, lunar age, and illuminated fraction for a selected date.
Date & TimeMilitary Time Converter
Convert between 12-hour standard time and 24-hour military time.
Date & TimeDays Calculator
Calculate the exact number of days between two dates.
Date & TimeYears Calculator
Calculate years, months, and days between two dates.
Date & TimeAge Difference Calculator
Compare two birth dates and calculate the exact calendar age gap.
Date & TimeDate of Birth Calculator
Work backward from an age and reference date to estimate the corresponding date of birth.
Date & TimeAnniversary Calculator
Calculate completed anniversaries, the next anniversary date, and time remaining.
Date & TimeDate Sequence Generator
Generate a recurring sequence of calendar dates by day, week, month, or year.
Date & TimeCalendar Quarter Calculator
Find the calendar quarter, quarter boundaries, and progress for any date.
Date & TimeTime Zone Meeting Planner
Compare a full day across several IANA time zones and find overlapping working hours.
Date & TimeTime Difference Calculator
Calculate the UTC offset difference between two IANA time zones at a chosen date and time.
Date & TimeUTC Offset Calculator
Find a time zone’s UTC offset for a chosen local date and time.
Date & TimeDST Transition Finder
Find clock and UTC-offset changes for an IANA time zone in a selected year.
Date & TimeEvent Time Announcer
Convert one event time into a copyable multi-time-zone schedule.
Date & TimeMulti Countdown Timer
Run several independent labeled countdown timers with per-timer alerts, all-start/pause/reset controls, local workspace restoration, progress and quick-add controls.
Date & TimeTime Expression Calculator
Evaluate multi-step time expressions using days, hours, minutes, and seconds without decimal-time conversion.
Date & TimeTime Multiplication Calculator
Multiply a duration by a numeric factor and normalize the result into days, hours, minutes, and seconds.
Date & TimeTime Division Calculator
Divide a duration by a positive number to split a time span into equal parts.
Date & TimeTime Rounding Calculator
Round a duration to a chosen minute increment using nearest, up, or down rounding.
Date & TimeTime Ratio Calculator
Compare two durations as a multiplier, percentage, and reduced whole-number ratio when possible.
Date & TimeAge Milestone Calculator
Find the calendar date when a starting date reaches a chosen day, week, month, or year milestone.
Date & TimeStopwatch Lap Time Calculator
Analyze pasted stopwatch lap times and calculate total, average, fastest, and slowest laps.
Date & TimeSplit Time to Lap Time Calculator
Convert cumulative stopwatch split times into individual lap times.
Date & TimeDate Midpoint Calculator
Find the midpoint date between two calendar dates and see the exact span around it.
Date & TimeNth Weekday Calculator
Find the first, second, third, fourth, fifth, or last weekday in any month.
Date & TimeBusiness Date Calculator
Add or subtract Monday–Friday business days from a date with optional custom holiday exclusions.
Date & TimeTime Clock Rounding Calculator
Round a clock time to a chosen 5-, 6-, or 15-minute increment using nearest, up, or down arithmetic.
Date & TimeLunch Break Calculator
Calculate lunch-break duration and net worked time from shift and break clock times.
Date & TimeInterval Timer
Run repeating active/rest intervals with configurable rounds and preparation time.
Date & TimePresentation Timer
Run a presentation countdown with a large shrinking progress ring, clear warning colors, presets, keyboard shortcuts, and centered fullscreen mode.
Date & TimeClassroom Timer
Run a projector-friendly classroom countdown with a large visual ring, quick presets, warning colors, and centered fullscreen mode.
Date & TimeMeeting Agenda Timer
Time a meeting agenda item by item against a planned schedule.
Date & TimeChess Clock
Run a two-player chess clock with configurable starting time and increment.
Date & TimeMultiple Alarm Clock
Set and manage several labeled browser alarms on one page.
Date & TimeMulti Stopwatch
Run several independent stopwatches for people, tasks, stations, or parallel activities.
Date & TimeWeekend Days Between Dates Calculator
Count Saturday and Sunday dates inside a calendar range.