Date & time tools

Count days between dates, convert timestamps and ISO 8601 dates, and build or explain cron schedules. Every tool runs in your browser, so nothing you add is uploaded.

Date calculators

Days, weeks, months and working days between dates, and adding or subtracting time from a date.

Date Difference

Counts the years, months, days and working days between two dates, or adds and subtracts days, weeks and months.

Timestamps & formats

Convert between Unix time, ISO 8601 and human-readable dates, and read ISO durations.

Unix Timestamp

Converts Unix timestamps to readable dates and back, detecting seconds, milliseconds, microseconds and nanoseconds.

ISO 8601 Converter

Converts dates to and from ISO 8601, including time zone offsets, week dates, ordinal dates and durations such as P1DT2H.

Cron schedules

Build cron expressions from plain choices, or explain existing ones and see exactly when a job will run.

Cron Generator

Builds cron expressions from plain choices such as “every weekday at 9:30” and writes them for crontab, Kubernetes, GitHub Actions, AWS and Quartz.

Cron Parser

Explains cron expressions in plain English and lists the next run times in any time zone.

About Date & time tools

Count the days, weeks, months or working days between two dates, or find the date a number of days from now, for deadlines, notice periods, countdowns and ages.

Tools for the dates and schedules that computers use: convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds into readable dates in any time zone, turn cron expressions into plain English with their next run times, convert and validate ISO 8601 dates and durations, and build new cron schedules without memorising the syntax.

Frequently asked questions

Which time zone are results shown in?

Your device’s time zone by default, together with UTC. You can switch to other common time zones in each tool.