Date & Time
Date math, timestamps, age, timezones and countdowns. 8 free online tools, all running locally in your browser.
Date CalculatorFree online tool to calculate days between two dates, add/subtract days, and count down to festivals.
Unix Timestamp ConverterFree online Unix timestamp converter. Handles seconds, milliseconds and microseconds, and outputs local time, UTC and ISO 8601.
Age CalculatorFree online age calculator with Chinese nominal age (xusui), Chinese zodiac, Western zodiac and days since birth.
Countdown TimerFree online countdown: set a target date and time to see days, hours, minutes and seconds remaining in real time, with quick presets for common dates.
Time Zone ConverterFree time zone converter: pick a source and target zone, enter a time, and see the converted time plus 24 major cities with local time and UTC offset.
Week Number CalculatorFree week number lookup: enter a date to get the ISO week and calendar week, the owning year, this week's start and end dates, and how far into the year you are.
Working Days CalculatorPick a date range to count total days, weekdays and weekend days, then adjust for public holidays and make-up work days.
Unix Timestamp ConverterConvert between timestamps and dates in both directions, with UTC, local time, zone offset, weekday, relative time and seven common formats at once.