Date & Time
10 free toolsCalculate dates, convert time zones, track work hours, and measure durations with precision. Every calculation runs locally in your browser — no data is sent anywhere.
Date & Time
About these date & time▼
Date and time calculations are deceptively complex. Varying month lengths (28, 29, 30, or 31 days), leap years, daylight saving time transitions, and 400+ time zones worldwide make manual date math error-prone. Even experienced developers regularly encounter bugs related to date handling.
The date and time tools on Toobits handle these edge cases correctly using the JavaScript Date API and the Intl internationalization API. The date calculator adds or subtracts days, weeks, months, and years with proper calendar arithmetic. The time zone converter uses the IANA time zone database for accurate worldwide conversions including DST. The hours calculator and time card calculator track work shifts with break deductions and overtime.
All calculations run locally in your browser. Your dates, schedules, and work hours are never sent to any server. These tools are used by project managers tracking deadlines, remote teams scheduling across time zones, freelancers logging billable hours, and anyone who needs precise date and time math.
Yes. All calculations use standard JavaScript Date APIs and internationally recognized calendar rules including leap years and daylight saving time.
No. All date and time calculations happen locally in your browser. Nothing is sent to any server.
Yes. The Time Zone Calculator uses the Intl API built into modern browsers, which follows the IANA time zone database for accurate worldwide conversions.
Once the page is loaded, most tools work without an internet connection since all processing happens in your browser.
Yes. All tools are fully responsive and tested on iOS and Android browsers.