Date and Time Tools
Calculate date differences, convert timestamps, work with time zones and manage timers.
Popular tasks
Calculate date differences, convert timestamps, work with time zones and manage timers.
- Date Difference Calculator
- Date and Time Addition Calculator
- Date and Time Subtraction Calculator
- Online Countdown Timer
About Date and Time Tools
How to use Date and Time Tools
Calculate date differences, convert timestamps, work with time zones and manage timers.
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Date Difference Calculator
Compare two dates as elapsed days and as calendar years, months and days, with the counting method visible.
Date and Time Addition Calculator
Add years, months, weeks, days, hours, minutes or seconds to a starting date and time.
Date and Time Subtraction Calculator
Subtract calendar or elapsed units from a starting date and time.
Online Countdown Timer
Run a configurable countdown with pause, resume, reset and browser alert controls.
Online Stopwatch
Measure elapsed time with start, pause, resume, lap and reset controls in the browser.
Unix Timestamp to Date Converter
Convert Unix seconds or milliseconds to readable UTC and local calendar times.
Date to Unix Timestamp Converter
Convert a calendar date and time to Unix seconds or milliseconds using an explicit time zone.
Unix Timestamp Converter
Convert between Unix timestamps and readable local or UTC date-time values.
Age Calculator
Calculate completed age and the remaining interval to the next birthday from a date of birth and reference date.
Gregorian and Lunar Calendar
Browse a monthly Gregorian calendar with optional Chinese lunar dates, holidays and date details.
Public Holiday Calendar Reference
Browse the holiday schedule available for the selected country or region and year.
Business Day Calculator
Add, subtract or count weekdays with configurable weekends and optional holiday exclusions.
Day of Week Calculator
Find the weekday for a Gregorian calendar date.
Current Beijing Time
Display the current time in China Standard Time, UTC+08:00, without daylight-saving changes.
Browser Alarm Clock
Set a local browser alarm for a chosen time and receive an on-screen or audible alert while the page remains active.
World Clock
Compare the current civil time across selected IANA time zones.
Gregorian to Chinese Lunar Calendar Converter
Convert a supported Gregorian date to its Chinese lunar year, month and day.
Chinese Lunar to Gregorian Converter
Convert a supported Chinese lunar date, including leap-month selection, to its Gregorian calendar date.
Chinese Almanac Date Reference
View traditional Chinese almanac labels and customary activity notes for a selected date.
24 Solar Terms Lookup
Find the traditional Chinese solar term near a selected date and year.
Chinese New Year Countdown
Count the time remaining until the next supported Chinese New Year date.
Days Alive Calculator
Measure elapsed days and an approximate calendar age between a birth date and a reference date.
Retirement Date Estimator
Estimate a retirement date from a birth date and selected retirement age.
Traditional Chinese Two-Hour Period Converter
Map a clock time to one of the twelve traditional Chinese two-hour periods.
BaZi Birth Chart Reference
Convert one local birth date and time into a transparent Four Pillars reference, with explicit solar-term, midnight and time-zone limitations.
Chinese Zodiac Year Chart
List Gregorian years associated with each traditional Chinese zodiac animal.
Western Zodiac Sign Finder
Find the commonly used tropical zodiac sign for a month and day.
Chinese Zodiac Animal Lookup
Look up the traditional Chinese zodiac animal associated with a supported year or date.
Date Calculator
Add or subtract calendar units, compare dates and inspect common date properties in one workspace.