Time & Date
Time and date utilities and converters
Work with time and dates efficiently. Convert timestamps, calculate differences, and manage time zones with ease.
All Time & Date
Timestamp Converter
Convert between Unix timestamps, ISO 8601, RFC dates, and human-readable formats with timezone support
Date Difference Calculator
Calculate the difference between two dates in years, months, weeks, days, hours, minutes, and seconds
Timezone Converter
Convert times between any timezones with meeting planner table for global team coordination
Cron Expression Parser
Parse cron expressions, see human-readable descriptions, and preview the next run times in any timezone
Age Calculator
Calculate exact age in years, months, days plus total days lived, hours lived, and time to next birthday
Business Days Calculator
Calculate working days between two dates with custom holiday lists and a configurable working week
Date Range Generator
Generate sequences of dates by daily, weekly, monthly, or custom step intervals with output as list, CSV, or JSON
What is in Time & Date
Date and time arithmetic that is easy to get wrong by hand: converting a Unix timestamp to a readable date, moving a time between zones, counting exact age, counting business days with a configurable working week and custom holidays, measuring the difference between two dates, and generating a sequence of dates.
Business day counting is where most spreadsheets quietly disagree with each other, because they differ on whether the start date counts, which days are the weekend and which holidays apply. The calculator here makes all three explicit rather than assuming.
Everything runs in your browser against your own locale and time zone, with no round trip to a server that might be in a different one.
The date range generator is the least obvious and the most useful once found. It produces a sequence of dates in daily, weekly or monthly steps and exports it as a list, CSV or JSON, which saves building the same column by hand in a spreadsheet.
Common questions
Do the calculators handle daylight saving changes?
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The timezone converter uses the browser's own time zone database, so daylight saving transitions are applied for the date in question rather than for today. That matters when converting a meeting time that falls on the far side of a clock change.
Can I set my own working week and holidays?
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Yes. The business days calculator lets you choose which days count as working days and add a custom holiday list, which is what makes it usable outside a Monday to Friday calendar.
Which timestamp formats are supported?
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Unix seconds and milliseconds in both directions, plus ISO 8601 and human readable output. The converter shows the same instant in several forms at once so you can spot a seconds against milliseconds mistake immediately.