Free Date and Time Tools
Free date and time tools to convert Unix timestamps, calculate the difference between dates, count down to a deadline, switch time zones, and convert military time.
How to choose the right tool
Date and time tools help when the input is a calendar date, clock time, timestamp, deadline, or time zone.
Unix timestamps may be seconds or milliseconds. Time zone tools use standard IANA zones where supported by the browser.
Choose by need
- Use date calculators for ages, differences, birthdays, due dates, and countdowns.
- Use time converters for military time, decimal hours, minutes, and time zones.
- Use timestamp tools when working with Unix seconds, milliseconds, UTC, or ISO strings.
Common tasks
- Find how many days remain before a deadline.
- Convert a Unix timestamp into local and UTC time.
- Calculate exact age, age difference, or time worked.
Choose a tool and get an instant result
BlinkCalc tools are designed to be fast, practical, privacy-conscious, and easy to understand. Many tools process inputs directly in your browser; tools that need a remote request explain that processing on their page.
Age & Milestone Tracker
Track exact age, days lived, next birthday, birthday countdown, and upcoming life milestones from any birth date.
Age Calculator
Find your exact age in years, months, and days from any date of birth.
Age Difference Calculator
Calculate the age difference between two people or any two dates.
Birthday Calculator
Find your exact age, day you were born, days until next birthday, and zodiac sign.
Countdown Timer & Stopwatch
Set any countdown with an audio alert. Includes a stopwatch with lap support.
Date Add/Subtract Calculator
Add or subtract days, weeks, months, and years from a start date and see the resulting date.
Date Difference Calculator
Find the exact days, weeks, months, and years between any two dates.
Due Date Countdown
Count down the days, hours, and minutes to any upcoming due date or event.
Military Time Converter
Convert between 24-hour military time and standard 12-hour AM/PM time.
Minutes to Hours
Convert any number of minutes to hours and minutes instantly.
Time Calculator
Add, subtract, and compare time durations in hours, minutes, seconds, days, and weeks.
Time to Decimal
Convert hours and minutes to a decimal number for payroll and billing.
Timestamp Converter
Convert Unix timestamps to readable dates and back.
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Frequently asked questions
What time zone do these tools use?
All conversions use your browser's local time zone by default. The time zone converter lets you switch to any IANA zone.
Can I convert Unix timestamps in seconds and milliseconds?
Yes. The timestamp converter auto-detects seconds vs milliseconds vs microseconds and shows ISO 8601, UTC, and local formats.
Do these tools account for daylight saving time?
Yes. Both the time zone converter and the date difference tools rely on the IANA tz database via the browser, so they respect DST automatically.