Date & Time

Work across timezones without the math

Scheduling a call between three cities or reading a UTC log timestamp in your local time is exactly the kind of mental arithmetic that goes wrong. The timezone converter takes a date and time in one zone and shows the equivalent in others, handling daylight saving transitions and standard offsets for you. When you need an at-a-glance view of multiple regions at once, the world clock displays several cities side by side so you can spot the overlap where everyone is awake.

Measure the distance between two dates

For anniversaries, deadlines, contract terms and age calculations, the date difference calculator returns the gap between two dates broken down into years, months, weeks and days, plus a total in each unit. When weekends and holidays should not count, the business days calculator excludes Saturdays and Sundays so you can work out true working-day lead times and delivery dates.

Formatting and week numbers

Different systems expect dates in different shapes. The date formatter converts a date into ISO 8601, US, European, long-form and custom patterns, which is handy when you need a value that a spreadsheet, API or filename will accept. For fiscal planning and sprint scheduling, the week number calculator tells you which ISO week a given date falls in, so a "week 23 review" lines up for everyone using the same standard.

Timers for focus and tracking

The category also covers the timers that structure a working day. The Pomodoro timer runs the classic 25-minute work intervals with short and long breaks to keep focus sustainable, the countdown timer counts down to a deadline or event, and the stopwatch measures elapsed time with lap support for workouts, cooking and timed tasks.

Common date and time workflows

• Cross-team scheduling - convert a proposed meeting time into every participant's local zone before you send the invite.
• Project planning - count business days to a deadline and confirm the ISO week a milestone falls in.
• Personal milestones - measure exact age, time until an event or days since a start date.
• Data formatting - reshape a date into ISO or a custom pattern for imports and filenames.
• Focus and timing - run Pomodoro cycles, count down to a launch or time an activity with a stopwatch.

Why browser-based date and time tools

These tools never need a server: time math, calendar logic and timers all run in JavaScript using your browser's clock and the standard Intl date APIs. That means results are instant, work offline once the page has loaded, and the dates, events and timers you enter are not uploaded or stored by ZeroUtil. There is no account and no saved history on our side.