Time & Date Calculators

Built for anyone converting a date and time between time zones — scheduling a call across countries, working out what time a message lands, or checking what time it is somewhere else — and for anyone turning daily clock-in/clock-out times into an hours or payroll total, whether that’s a personal timesheet or a small team’s.

Use the Time Zone Converter for single-instant conversion (one date/time, compared across as many zones as you add) with live daylight-saving handling pulled from your browser’s own time zone database rather than a printed chart. Use the Timesheet Calculator for a weekly, biweekly, or monthly grid of clock-in/clock-out times with lunch-break deduction, an optional overtime threshold, and an Excel export.

If you specifically need a Unix timestamp, a Discord message-timestamp code, or a plain 12-hour ↔ 24-hour military-time conversion with no zone change involved, those are separate, more specialized tools that are planned but not yet published — see the FAQs below for the current state.

1. 1Enter the date and time you have, and the zone it’s in, in the Time Zone Converter.
2. 2Use a popular pair (EST to IST, IST to GMT/BST, and more) as a shortcut for the most commonly searched conversions.
3. 3For hours worked, pick a period length in the Timesheet Calculator and enter each day’s clock-in, clock-out, and break.
4. 4Turn on the overtime threshold if it applies, then use Download Excel to keep a copy of the totals.

• Assuming a zone’s abbreviation (like EST or CST) always means the same offset — several abbreviations are reused for unrelated zones on different continents; the converter always shows the full UTC offset alongside any abbreviation.
• Forgetting that a converted time can land on the next or previous calendar day — always check for the +1 day / −1 day marker before booking something.
• Treating a fixed-offset zone like India (IST) the same as a zone that observes daylight saving — the gap between them changes by an hour twice a year even though IST itself never moves.
• Assuming the Timesheet Calculator’s overtime option applies your specific state, country, or employer’s exact rules — it’s a single configurable weekly threshold, not a jurisdiction-specific calculation.

The Time Zone Converter is accurate for essentially all everyday and business scheduling use, but depends on your browser and operating system having an up-to-date time zone database — a device that hasn’t updated in a long time may not yet reflect a very recently changed political time zone or DST rule. For legal, contractual, travel, or safety-critical timing (flight departures, court deadlines, financial settlement windows), confirm with an authoritative source rather than relying on any calculator alone. The Timesheet Calculator applies simple, transparent arithmetic — it is not a substitute for your employer’s payroll system or a program’s mandated timesheet system, and does not implement jurisdiction-specific overtime law.

The Time Zone Converter does not maintain its own offset table — every conversion is computed live from the browser’s built-in time zone API, which implements the IANA Time Zone Database, the authoritative source used by nearly every operating system and programming language worldwide. The Timesheet Calculator uses plain clock-time arithmetic; its optional overtime model is structured after the US Fair Labor Standards Act’s weekly-threshold concept as a generic, configurable reference point, not as jurisdiction-specific guidance.

See the Methodology for how calculators are built and reviewed, who runs the site, the Disclaimer for the full terms, and the Contact page to report an issue.