12 available tools
Time Tools
Calculate dates, durations, time differences, ISO weeks, days of year, time zones, and live countdowns.
Available tools
Date Calculator
Add or subtract days, weeks, months, or years from a date with correct month-end handling.
Time Difference Calculator
Calculate time between two clock times in hours, minutes, seconds, and decimal hours, including overnight spans.
Date Countdown
See live days, hours, minutes, and seconds remaining until a future date and time.
Day of Year Calculator
Find a date's ordinal day number, remaining days, and year progress.
Week Number Calculator
Calculate a date's ISO 8601 week number, ISO year, and Monday-to-Sunday range.
Date and Time Duration Calculator
Measure the exact elapsed duration between two dates and times in real days, hours, minutes, and seconds.
Time Ago Calculator
Calculate how long ago a date and time was or how far away it is, with relative and exact results.
Decimal Hours Converter
Convert decimal hours to hours and minutes, or an HH:MM duration to decimal hours and total minutes.
Time Zone Difference Calculator
Compare offsets and time difference between IANA zones for a specific date, accounting for clock changes.
Leap Year Calculator
Check whether a year is a leap year using Gregorian rules and see upcoming leap years.
Online Stopwatch
Measure elapsed time and laps with a precise stopwatch that handles background pauses.
Online Timer
Set a precise countdown, pause it, and receive an alert when it finishes.
Showing 1–12 of 12 tools
Dates, calendars, and durations
Add or subtract calendar periods, measure distances between clock times or instants, and find ordinal days, ISO weeks, or leap years. Civil dates remain separate from actual elapsed durations to avoid ambiguous results.
Use Date Countdown for a live deadline or Time Ago Calculator for a relative interval. Stopwatch and Timer remain available for immediate sessions.
Conversions and time zones
Convert decimal hours to hours and minutes or compare IANA zones on a specific date. Zone differences use browser-provided rules and can change with seasonal clock adjustments.
All calculations run locally without date APIs or external services.
Frequently asked questions
Which date tool should I use?
Use Date Calculator to add or subtract periods, Days Between Dates for civil dates, and Date and Time Duration for actual elapsed time.
How do I calculate hours between two times?
Time Difference Calculator reports duration, decimal hours, minutes, and seconds, including overnight intervals.