Academic Year Calculator
Calculate academic year/semester for a given date.
Date and Time Tools
Convert timezones, work with Unix timestamps, calculate date differences, and use countdown timers and stopwatches.
Our free online date and time tools simplify working with temporal data. Convert times between world timezones instantly, translate Unix timestamps to human-readable dates and back, calculate the exact difference between two dates in multiple units, set countdown timers with visual alerts, and track elapsed time with a precise millisecond stopwatch. Ideal for developers working with APIs and databases, remote teams coordinating across timezones, project managers tracking deadlines, and anyone who needs accurate time calculations without complex software.
Available Tools
Age at Date Calculator
Calculate age at a specific date.
Age Difference Calculator
Calculate the age difference between two people from their birth dates.
Age in Days Calculator
Calculate your age in days, hours, minutes, and seconds.
Age on Other Planets
Calculate your age on other planets.
Akan Calendar Converter
Convert Gregorian to Akan calendar (Ghanaian).
Amharic Calendar Converter
Convert Gregorian to Amharic/Ethiopian calendar variant.
Anno Domini Calculator
Convert between AD/BC and astronomical year numbering.
Anno Mundi Calculator
Convert to Anno Mundi (Hebrew year from creation).
Assyrian Calendar Converter
Convert Gregorian to Assyrian calendar.
Atomic Clock Display
Display time with millisecond precision (simulated atomic clock).
Aztec Calendar Converter
Convert to Aztec Tonalpohualli calendar.
Balinese Calendar Converter
Convert Gregorian to Balinese Pawukon calendar.
Balinese Saka Calendar Converter
Convert between Gregorian and Balinese Saka calendar.
Bengali Calendar Converter
Convert Gregorian to Bengali calendar.
Bengali Date Converter
Convert between Gregorian and Bengali calendar systems.
Berber Calendar Converter
Convert Gregorian to Berber/Amazigh calendar.
Biorhythm Calculator
Calculate biorhythm cycles from birth date.
Birthday Paradox Calculator
Calculate probability of shared birthdays in a group.
Buddhist Calendar Converter
Convert between Gregorian and Buddhist Era (BE) dates.
Burmese Calendar Converter
Convert Gregorian to Burmese calendar.
Business Days Calculator
Calculate business days between two dates excluding weekends.
Byzantine Calendar Converter
Convert to Byzantine calendar (Anno Mundi variant).
Callippic Cycle Calculator
Calculate Callippic cycle (76-year calendar cycle).
Candle Burn Time Calculator
Calculate candle burn time from dimensions and wax type.
Century Calculator
Determine which century and millennium a year belongs to.
Chinese Calendar Converter
Convert between Gregorian and Chinese calendar dates.
Chinese Zodiac Calculator
Determine Chinese zodiac animal from birth year.
Coptic Alexandrian Date Converter
Convert Gregorian to Coptic Alexandrian with feast days.
Coptic Calendar Converter
Convert between Gregorian and Coptic calendar dates.
Cosmic Calendar Converter
Map Earth's history to a single calendar year.
Countdown Timer
Set countdown timers with visual alerts when time is up.
Countdown to New Year
Live countdown to next New Year's Eve.
Cron Next Run Calculator
Calculate next run times for a cron expression.
Date Add/Subtract
Add or subtract days/months/years from a date.
Date Difference Calculator
Calculate the difference between two dates in multiple time units.
Date Format Converter
Convert dates between formats (US, EU, ISO, etc.).
Date Formatter
Format dates in ISO, US, EU, and custom patterns.
Date Pattern Generator
Generate date strings in custom patterns (YYYY-MM-DD, etc.).
Date Range Generator
Generate a list of dates between start and end with configurable step.
Date to Day of Week
Find what day of the week any date falls on.
Date to Unix Timestamp
Convert any date to Unix timestamp (seconds and milliseconds).
Day of Year Calculator
Calculate what day number of the year a date is (1-365/366).
Daylight Hours Calculator
Estimate daylight hours for a date and latitude.
Daylight Saving Checker
Check if a date falls in daylight saving time for a timezone.
Days Until Calculator
Calculate days, weeks, and hours until any target date.
Deadline Calculator
Calculate deadlines by adding business or calendar days.
Decimal Time Converter
Convert standard time to decimal/metric time.
Discordian Calendar Converter
Convert Gregorian to Discordian calendar.
Dreamspell Calendar Converter
Convert Gregorian to Dreamspell/13 Moon calendar.
DST Transition Checker
Check when DST transitions occur for any timezone/year.
Earth Age Calculator
Calculate Earth's age in various time units.
Egyptian Calendar Converter
Convert Gregorian to ancient Egyptian civil calendar.
Epoch Converter
Convert between epoch/Unix timestamps and human dates.
Equinox and Solstice Calculator
Calculate dates of equinoxes and solstices for any year.
Equinox Solstice Date Finder
Find precise equinox and solstice dates for any year.
Ethiopian Calendar Converter
Convert between Gregorian and Ethiopian calendar.
Event Countdown Calculator
Calculate exact time remaining until a future event.
Event Countdown Creator
Create custom countdowns to any named event with multiple units.
Fiscal Year Calculator
Determine fiscal quarter/year for any date.
French Republican Calendar Converter
Convert dates to the French Republican Calendar.
Golden Hour Calculator
Calculate golden hour times for photography.
GPS Time Converter
Convert between GPS time and UTC.
Gregorian to Julian Converter
Convert dates between Gregorian and Julian calendars.
Gujarati Calendar Converter
Convert Gregorian to Gujarati calendar.
Half-Life Calculator
Calculate radioactive half-life decay over time.
Hausa Calendar Converter
Convert Gregorian to Hausa calendar (Nigerian).
Hebrew Calendar Converter
Convert between Gregorian and Hebrew calendar dates.
Holiday Countdown
Countdown to major holidays (Christmas, New Year, etc.).
Hourglass Calculator
Calculate sand flow rate for hourglass timing.
Human Era Calendar Converter
Convert dates to Holocene/Human Era calendar.
Igbo Calendar Converter
Convert Gregorian to Igbo calendar (Nigerian).
Incense Burn Time Calculator
Calculate incense stick/cone burn time.
Indian Calendar Converter
Convert between Gregorian and Indian National (Saka) calendar.
Indiction Cycle Calculator
Calculate 15-year Indiction cycle position.
Islamic Calendar Converter
Convert between Gregorian and Islamic/Hijri calendar.
ISO 8601 Week Calculator
Calculate ISO 8601 week number for any date.
ISO Week Calculator
Calculate ISO week number and year for any date.
ISO Week Date Converter
Convert between ISO week dates (2024-W01-1) and calendar dates.
Japanese Era Converter
Convert between Gregorian and Japanese era (Reiwa, Heisei, etc.).
Juche Calendar Converter
Convert Gregorian to North Korean Juche calendar.
Julian Date Converter
Convert between Julian Day Number and Gregorian calendar dates.
Julian Day Calculator
Calculate Julian Day Number for astronomical use.
Kali Yuga Calculator
Calculate position in Hindu Kali Yuga cycle.
Kannada Calendar Converter
Convert Gregorian to Kannada calendar.
Leap Year Checker
Check if a year is a leap year with explanation.
Light Travel Time Calculator
Calculate how long light takes to travel a distance.
Liturgical Calendar Calculator
Calculate Christian liturgical season for any date.
Lunar Calendar Converter
Convert between Gregorian and approximate lunar calendar dates.
Lunar Phase Tracker
Track lunar phases with illumination and moonrise times.
Malayalam Calendar Converter
Convert Gregorian to Malayalam/Kollam calendar.
Marathi Calendar Converter
Convert Gregorian to Marathi/Shalivahana calendar.
Maya Long Count Today
Show today's date in Maya Long Count notation.
Mayan Calendar Converter
Convert Gregorian dates to Mayan Long Count.
Meeting Duration Calculator
Calculate total meeting time from a list of meetings.
Meeting Scheduler
Schedule meetings across multiple time zones.
Meeting Time Planner
Find overlapping business hours across timezones.
Mercury Retrograde Checker
Check if Mercury is in retrograde for a given date.
Metonic Cycle Calculator
Calculate Metonic cycle (19-year lunar cycle) position.
Minguo Calendar Converter
Convert Gregorian to Republic of China (Minguo) calendar.
Moon Phase Calculator
Calculate moon phase for any date.
Multi-Timezone Converter
Convert a single time to multiple timezones simultaneously.
Nanakshahi Calendar Converter
Convert Gregorian to Sikh Nanakshahi calendar.
Nepali Calendar Converter
Convert between Gregorian and Nepali Bikram Sambat.
Network Time Protocol Viewer
Show NTP-style time with precision display.
Numerology Life Path Calculator
Calculate numerology life path number from birth date.
Odia Calendar Converter
Convert Gregorian to Odia/Oriya calendar.
Olympiad Calculator
Calculate which ancient Greek Olympiad a year falls in.
Orbital Period Calculator
Calculate orbital period from altitude/mass.
Ordinal Day Calculator
Calculate ordinal day number (1-366) for any date.
Pay Period Calculator
Calculate pay dates for schedules.
Payroll Date Calculator
Calculate next payday based on pay frequency.
Pendulum Clock Calculator
Calculate pendulum length for desired period.
Persian Calendar Converter
Convert between Gregorian and Persian/Solar Hijri calendar.
Persian Jalali Date Converter
Convert between Gregorian and Persian Jalali calendars.
Planetary Alignment Checker
Check approximate planetary positions for a date.
Pomodoro Timer
Pomodoro timer with configurable work/break and session tracking.
Pregnancy Due Date Calculator
Calculate estimated due date from last menstrual period.
Project Timeline Estimator
Estimate project timelines from task durations.
Punjabi Calendar Converter
Convert Gregorian to Punjabi/Nanakshahi variant.
Quarter Calculator
Find which fiscal/calendar quarter a date falls in.
Recurring Date Calculator
Calculate next occurrences of recurring events (weekly, monthly, yearly).
Recurring Event Calculator
Calculate dates for recurring events (daily/weekly/monthly).
Regnal Year Calculator
Convert between regnal years and Gregorian dates.
Relative Time Calculator
Convert dates to relative time like "2 hours ago" or "in 3 days".
Retirement Age Calculator
Calculate time until retirement from birth date and target age.
Roman Ab Urbe Condita Converter
Convert years to Roman AUC (from founding of Rome, 753 BC).
Roman Calendar Converter
Convert between Gregorian years and Roman AUC calendar.
Saka Era Calculator
Convert Gregorian to Indian Saka era dates.
Saros Cycle Calculator
Calculate Saros eclipse cycle (18 years, 11 days).
School Year Progress
Calculate progress through the school year.
Season Calculator
Determine which season a date falls in (configurable hemisphere).
Semester Countdown
Countdown to end of current semester/term.
Shift Schedule Planner
Plan rotating shift schedules with configurable patterns.
Sidereal Time Calculator
Calculate local and Greenwich mean sidereal time.
Sleep Cycle Calculator
Calculate optimal wake/sleep times based on 90-minute sleep cycles.
Solar Eclipse Calculator
Calculate approximate dates of solar eclipses.
Solar Noon Calculator
Calculate exact solar noon time for any location and date.
Sprint Planning Calculator
Calculate sprint capacity and velocity for agile teams.
Stardate Calculator
Convert Gregorian dates to Star Trek stardates.
Stopwatch
Track elapsed time with millisecond precision using start and stop.
Sundial Time Calculator
Calculate sundial shadow angle for a given time/latitude.
Sunrise & Sunset Calculator
Estimate sunrise/sunset times for a given latitude and date.
Sunrise Sunset Time Estimator
Estimate sunrise/sunset with twilight and golden hour.
Swahili Calendar Converter
Convert Gregorian to Swahili calendar.
Swatch Internet Time
Convert to Swatch Internet Time (.beats).
TAI Time Converter
Convert between UTC and TAI (International Atomic Time).
Tamil Calendar Converter
Convert Gregorian to Tamil calendar.
Telugu Calendar Converter
Convert Gregorian to Telugu calendar.
Thai Buddhist Era Converter
Convert between Gregorian CE and Thai Buddhist Era BE.
Thai Calendar Converter
Convert between Gregorian and Thai Buddhist calendar.
Thai Lunar Calendar
Convert to Thai lunar calendar dates.
Thai Solar Calendar Converter
Convert Gregorian to Thai solar calendar with Buddhist era.
Tibetan Calendar Converter
Convert Gregorian to Tibetan calendar.
Time Addition Calculator
Add multiple time durations together (HH:MM:SS format).
Time Between Dates
Calculate exact time between two dates in all units.
Time Card Calculator
Calculate weekly hours from clock in/out.
Time Dilation Calculator
Calculate relativistic time dilation.
Time Duration Calculator
Add or subtract hours, minutes, seconds from any start time.
Time Duration Formatter
Format time durations between seconds, HH:MM:SS, ISO 8601.
Time Elapsed Since Event
Calculate time elapsed since a historical event.
Time Since Calculator
Calculate how long ago an event happened.
Time Until Calculator
Calculate time remaining until a date.
Time Until Event
Calculate exact time remaining until a specific date/time.
Time Zone Converter (Batch)
Convert a time to multiple timezones at once.
Time Zone Map Viewer
Show UTC offsets for all major timezones in a list view.
Time Zone Offset Calculator
Calculate time difference between any two timezones.
Time Zone Overlap Finder
Find overlapping working hours between time zones.
Timezone Abbreviation Lookup
Look up timezone abbreviations (PST, EST, GMT, etc.) with UTC offsets.
Timezone Converter
Convert times between different timezones worldwide instantly.
Timezone List Generator
Generate a list of all timezones with current times.
Timezone Meeting Planner
Find overlapping work hours across timezones.
Timezone Offset Calculator
Calculate time difference between any two timezones.
Unix Epoch Converter
Convert between Unix epoch timestamps and dates.
Unix Epoch Countdown
Live countdown to next Unix epoch milestones.
Unix Timestamp Converter
Convert between Unix timestamps and readable date-time strings.
Unix Timestamp to Date
Convert Unix timestamp to human-readable date.
UTC Time Converter
Convert local time to UTC and UTC to local time.
Vikram Samvat Converter
Convert Gregorian to Vikram Samvat (Hindu calendar).
Water Clock Calculator
Calculate water clock (clepsydra) flow rate for timekeeping.
Week Number Calculator
Find ISO week number, day of year, and days remaining for any date.
Weekday Counter
Count specific weekdays between two dates.
Work Hours Calculator
Calculate work hours with break deduction and earnings.
Work Week Calculator
Calculate work weeks between two dates (excluding holidays).
Workday Counter
Count working days in a month or between dates (excluding weekends).
World Calendar Converter
Convert between multiple world calendar systems at once.
World Clock
Show current time in multiple world cities.
World Clock Display
Display current time in multiple cities simultaneously.
Yoruba Calendar Converter
Convert Gregorian to Yoruba calendar (Nigerian).
Zodiac Sign Calculator
Determine zodiac sign from birth date with date ranges.
Zoroastrian Calendar Converter
Convert Gregorian to Zoroastrian calendar.