Date & Time
Calculate dates, convert time zones, track work hours, and measure durations with precision. Every calculation runs locally in your browser — no data is sent anywhere.
10 free toolsDate 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.
Date & Time
Pomodoro Timer
Free online Pomodoro timer. Set work and break intervals, get desktop notifications and sound alerts when each session ends. Track your daily focus sessions. No signup required.
📅Date Calculator
Free online date calculator. Add or subtract days, weeks, months, or years from any date, or find the exact difference between two dates.
⏱Stopwatch & Timer
Free online stopwatch and countdown timer. Precise millisecond stopwatch with lap tracking. Countdown timer with audio alert. Works in the background. No signup required.
🌍Time Zone Calculator
Free online time zone calculator. Convert a date and time from one time zone to multiple destinations worldwide.
📅Days Between Dates
Free tool to calculate days between two dates. Find exact days, weeks, months, and business days between any two dates.
⏱️Time Calculator
Free online time calculator. Add or subtract hours, minutes, and seconds, or sum multiple time entries for a total duration.
⏰Hours Calculator
Free online hours calculator. Enter start time, end time, and break duration to calculate hours worked. Includes a weekly total tracker.
🗓️Time Card Calculator
Free online time card calculator. Enter clock-in and clock-out times for a full week with break deductions, overtime, and optional pay calculation.
⏳Time Duration Calculator
Free online time duration calculator. Find the exact duration between two dates and times in years, months, days, hours, minutes, and seconds.
📆Day of the Week Calculator
Free online day of the week calculator. Enter any date and instantly find out what day of the week it falls on.
Frequently Asked Questions
Are these date and time tools accurate?▼
Yes. All calculations use standard JavaScript Date APIs and internationally recognized calendar rules including leap years and daylight saving time.
Is my data stored or sent anywhere?▼
No. All date and time calculations happen locally in your browser. Nothing is sent to any server.
Do these tools handle time zones correctly?▼
Yes. The Time Zone Calculator uses the Intl API built into modern browsers, which follows the IANA time zone database for accurate worldwide conversions.