Which time zone is used?

Your device time zone by default. Most tools let you pick any IANA time zone.

Does it handle seconds and milliseconds timestamps?

Yes. The timestamp converter detects 10-digit seconds and 13-digit milliseconds automatically.

Are these tools free to use?

Yes. Every tool is free, needs no account and has no usage limits beyond what your browser and device can handle.

Date & Time tools

Convert Unix timestamps, format dates, compare timezones, calculate durations and age, parse cron schedules and work with ISO 8601 — instantly and offline.

15 tools in this category · 4 sub-categories

Calculators

Duration Calculator

Calculate the difference between two dates, or add/subtract time.

Age Calculator

Calculate exact age and countdown to the next birthday.

Business Days Calculator

Count business days between two dates, excluding holidays.

Leap Year Checker

Check if a year is a leap year and find nearby leap years.

Work Hours & Timesheet Calculator

Total up work hours across shifts with breaks and hourly pay.

Day of Year Calculator

Convert a date to its day-of-year number, or back again.

Formatting & Cron

Date Formatter

Format a date using custom patterns and Intl presets.

Timezone Converter

Convert a datetime across multiple IANA timezones at once.

Countdown Timer Generator

Live countdown to any date and time.

Stopwatch & Countdown Timer

Precision stopwatch with laps plus a countdown timer with alarm.

More Tools

Pomodoro Timer

Focus timer with customisable work sprints and breaks.

Timestamps

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates.

ISO 8601 Converter

Convert dates and durations to and from ISO 8601 format.

Week Number Calculator

Find the ISO week number, day of year, and quarter for any date.

Epoch Batch Converter

Convert a list of Unix timestamps to readable dates in bulk.

About date & time tools

Convert Unix timestamps, format dates, compare time zones, count business days and calculate durations and ages. Results update as you type.