Time & Date Calculators
Browse our comprehensive collection of time and date calculators for time zones, date differences, age, calendars, work hours, countdowns, and more. Free online tools for scheduling, planning, and time management.
12-Hour to 24-Hour Time
Convert time between 12-hour (AM/PM) and 24-hour formats with step-by-step conversion.
time-convertTime Duration Calculator
Calculate the duration between two times (hours/minutes) and total minutes or seconds.
time-convertDecimal to Time Converter
Convert decimal hours to HH:MM:SS format and vice versa.
time-convertTime Addition & Subtraction
Add or subtract hours, minutes, and seconds from a given time.
time-convertSeconds to HH:MM:SS
Convert total seconds to hours, minutes, and seconds format.
time-convertMilliseconds to Time
Convert milliseconds to formatted time (HH:MM:SS.sss).
time-convertTime to Minutes/Seconds
Convert a time value to total minutes or total seconds.
time-convertMilitary Time Converter
Convert between standard and military time (24-hour) with explanations.
time-convertDate Difference Calculator
Calculate the exact number of days, months, and years between two dates.
date-calcAdd/Subtract Days to Date
Add or subtract a number of days, weeks, or months from a given date.
date-calcBusiness Days Calculator
Calculate working days between dates, excluding weekends and holidays.
date-calcWeekdays Between Dates
Count the number of weekdays (Mon-Fri) and weekends between two dates.
date-calcDay of the Week Finder
Find the day of the week for any given date (e.g., Monday, Tuesday).
date-calcCalendar Month Calculator
Determine the number of days in a specific month and year.
date-calcISO Week Number Calculator
Calculate the ISO week number for any date.
date-calcDate to Julian Day
Convert a Gregorian date to Julian Day Number (JDN).
date-calcTime to Decimal Converter
Convert HH:MM:SS to decimal hours, minutes, or seconds.
miscDecimal Hours to Time
Convert decimal hours to HH:MM:SS format.
miscDate Format Converter
Convert dates between different formats (YYYY-MM-DD, DD/MM/YYYY, etc.).
miscMoon Phase Calculator
Find the moon phase for a given date.
miscUnix Timestamp Converter
Convert Unix timestamps to readable dates and vice versa.
miscTime Span Calculator
Calculate total time span across multiple time intervals.
miscCyclical Time Converter
Convert between different calendar systems (Gregorian, Julian, etc.).
miscTime Zone Name Lookup
Find the full name and abbreviation of a time zone by offset.
miscWhat Are Time & Date Calculators?
Our Time & Date Calculators collection provides essential tools for managing schedules, planning events, and understanding time-related calculations. Whether you need to convert time zones, calculate age, find the difference between dates, or plan work hours, these calculators deliver accurate results with clear explanations.
From time conversion and date difference to age calculation, calendar generation, and world time management, our tools cover every aspect of time and date handling.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific calculators by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific time/date topic — each option shows the number of calculators available.
- Click to Use: Each card links directly to the tool. Click on any card to start your time or date calculation instantly.
- Explore Category Pages: Use the "Explore All Time & Date Calculator Categories" section to access dedicated pages with even more tools.
Why Use Our Time & Date Calculators?
- Comprehensive Coverage: Covers time conversion, date calculation, age, calendars, work hours, world time, countdowns, and more.
- Accurate & Reliable: Uses precise algorithms and time zone databases.
- Free & Accessible: No registration, no fees — use any tool instantly on any device.
- Educational: Many tools explain the formulas and principles behind the calculations.
- Professional & Personal Use: Designed for project managers, HR professionals, event planners, and anyone managing time.
❓ Time & Date Calculators FAQ
What types of time and date calculations can I perform?
You can convert between 12h/24h time, calculate durations, convert decimal time, add/subtract time, calculate date differences, add/subtract days, find business days, determine weekdays, calculate age in years/months/days, generate calendars, find week numbers, check leap years, convert time zones, set countdowns, and more.
How do I calculate the time between two times?
Use our Time Duration Calculator. Enter the start and end times, and the tool will compute the difference in hours, minutes, and seconds.
How do I calculate my exact age?
Use our Age Calculator. Enter your date of birth, and the calculator will show your age in years, months, days, hours, minutes, and even seconds.
How do I convert between time zones?
Use our Time Zone Converter. Select the source and target time zones, enter the time, and the tool will show the converted time with DST adjustments.
How do I calculate the number of business days between two dates?
Use our Business Days Calculator. Enter the start and end dates, and the tool will count working days (weekdays) excluding weekends and optionally holidays.
How do I find the day of the week for any date?
Use our Day of the Week Finder. Enter a date, and the calculator will tell you which day of the week it falls on.
How do I set a countdown timer?
Use our Countdown Timer. Enter the target date and time, and the timer will show the remaining days, hours, minutes, and seconds until that moment.
Are these tools suitable for professional scheduling?
Yes, our work-related calculators (work hours, time cards, overtime, shift planning) are designed for HR, payroll, and project management professionals.
How often are new time/date calculators added?
We regularly add new tools based on user requests. If you have a suggestion, please contact us.
Can I use these calculators for legal or official purposes?
While our calculators are accurate, they are provided for informational and planning purposes. For legal or official use, please verify with authoritative sources.