Date & Time

Unix Timestamp Converter

Free online Unix timestamp converter — convert between Unix timestamps and human-readable dates instantly in your browser. No data is stored. Supports seconds and milliseconds, shows ISO 8601 and UTC formats.

ISO 8601 Converter

Free online ISO 8601 converter — convert dates to all ISO 8601 representations instantly in your browser. No data is stored. Shows date-only, date-time, full, ISO week, and ordinal formats.

RFC 2822 Converter

Free online RFC 2822 converter — convert dates to and from RFC 2822 email date format instantly in your browser. No data is stored. Shows both RFC 2822 and ISO 8601 representations.

Epoch Converter

Free online epoch converter — convert between Unix seconds, milliseconds, microseconds, and nanoseconds instantly in your browser. No data is stored. Also shows Excel serial and Julian Day.

Date Formatter

Free online date formatter — format dates using custom patterns like YYYY-MM-DD HH:mm:ss instantly in your browser. No data is stored. Supports day names, 12/24h, AM/PM, and timezone offsets.

Date Parser

Free online date parser — parse any date string format into year, month, day, and time components instantly in your browser. No data is stored. Handles ISO 8601, timestamps, and natural formats.

Julian Day Converter

Free online Julian Day converter — convert between Julian Day Numbers and calendar dates instantly in your browser. No data is stored. Useful for astronomy and historical date calculations.

Excel Date Converter

Free online Excel date converter — convert between Excel serial date numbers and calendar dates instantly in your browser. No data is stored. Handles the Excel leap year bug for accuracy.

Relative Time

Free online relative time converter — convert dates to human-readable relative format like '2 days ago' instantly in your browser. No data is stored. Supports past and future dates with auto-scaling units.

Date to Words

Free online date to words converter — spell out any date in written English form instantly in your browser. No data is stored. Produces ordinal day names and year in words.

Timezone Converter

Free online timezone converter — convert dates and times between IANA timezones instantly in your browser. No data is stored. Supports all major world timezones with full date formatting.

UTC Converter

Free online UTC converter — convert between local time and UTC instantly in your browser. No data is stored. Supports any IANA timezone with full date and time display.

Date Difference

Free online date difference calculator — compute the gap between two dates in years, months, weeks, and days instantly in your browser. No data is stored. Also shows hours, minutes, and seconds.

Date Add/Subtract

Free online date add/subtract tool — add or subtract days, months, and years from any date instantly in your browser. No data is stored. Supports hours, minutes, seconds, and weeks.

Age Calculator

Free online age calculator — compute exact age from birthdate instantly in your browser. No data is stored. Shows years, months, days, total days, and next birthday.

Workdays Calculator

Free online workdays calculator — count business days between two dates instantly in your browser. No data is stored. Excludes weekends and shows total calendar days breakdown.

Week Number

Free online week number calculator — get the ISO week number for any date instantly in your browser. No data is stored. Shows ISO week year, week number, and day of week.

Quarter Calculator

Free online quarter calculator — determine the fiscal quarter for any date instantly in your browser. No data is stored. Shows quarter number, start date, and end date.

Day of Year

Free online day of year calculator — find the day number within the year for any date instantly in your browser. No data is stored. Shows remaining days, year progress percentage, and leap year status.

Leap Year Checker

Free online leap year checker — check if any year is a leap year with detailed explanation instantly in your browser. No data is stored. Shows divisibility rules and nearby leap years.

Days in Month

Free online days in month calculator — find how many days are in any month instantly in your browser. No data is stored. Handles leap years and accepts date strings or YYYY-MM format.

Date Range Generator

Free online date range generator — create a sequence of dates between start and end dates instantly in your browser. No data is stored. Supports daily, weekly, and monthly intervals.

Timezone List

Free online timezone list — browse all major IANA timezone names with current local times instantly in your browser. No data is stored. Filter by region like Europe, Asia, or America.

World Clock

Free online world clock — view current time in multiple cities around the world instantly in your browser. No data is stored. Shows 10 major cities by default or custom IANA timezones.

Duration Calculator

Free online duration calculator — add and subtract time durations in HH:MM:SS format instantly in your browser. No data is stored. Shows result in formatted time and total seconds.

Duration Formatter

Free online duration formatter — convert milliseconds to human-readable duration instantly in your browser. No data is stored. Breaks down into days, hours, minutes, seconds, and ms.

Time Parser

Free online time parser — parse any time string format into hours, minutes, and seconds components instantly in your browser. No data is stored. Outputs both 12-hour and 24-hour formats.

12h/24h Time Converter

Free online 12h/24h time converter — convert between 12-hour and 24-hour time formats instantly in your browser. No data is stored. Handles AM/PM and supports seconds.

Countdown Calculator

Free online countdown calculator — compute time remaining until any target date instantly in your browser. No data is stored. Shows days, hours, minutes, and seconds breakdown.

Meeting Planner

Free online meeting planner — find overlapping business hours between timezones instantly in your browser. No data is stored. Compares multiple IANA timezones and shows common availability windows.

Cron Builder

Free online cron builder — create cron expressions with presets or custom fields instantly in your browser. No data is stored. Supports presets like hourly, daily, weekday, and custom schedules.

Cron Parser

Free online cron parser — explain cron expressions in human-readable form instantly in your browser. No data is stored. Breaks down minute, hour, day, month, and weekday fields.

Cron Next Runs

Free online cron next runs calculator — preview upcoming execution times for any cron expression instantly in your browser. No data is stored. Shows next N scheduled runs with dates.

Cron Validator

Free online cron validator — check cron expression syntax for errors instantly in your browser. No data is stored. Validates all five fields with range and step checks.

Cron to English

Free online cron to English converter — translate cron expressions to plain English instantly in your browser. No data is stored. Supports common patterns and complex schedules.

English to Cron

Free online English to cron converter — turn natural language schedule descriptions into cron expressions instantly in your browser. No data is stored. Supports phrases like 'every weekday' and 'every day at 9am'.

Rate Limiter Calculator

Free online rate limiter calculator — compute rate limiting parameters and conversions instantly in your browser. No data is stored. Shows requests per second/minute/hour, token bucket, and sliding window analysis.

Interval Calculator

Free online interval calculator — compute time intervals, frequencies, and execution counts instantly in your browser. No data is stored. Shows requests per second, per minute, per hour, and token bucket analysis.

Calendar Generator

Free online calendar generator — create a text calendar for any month and year instantly in your browser. No data is stored. Displays weekday grid with Sun-Sat layout.

Holiday Lookup

Free online holiday lookup — find US and international holidays for any year instantly in your browser. No data is stored. Lists federal holidays with exact dates and day-of-week.

iCal Generator

Free online iCal generator — create .ics calendar file content for events instantly in your browser. No data is stored. Supports all-day events, descriptions, and locations.

iCal Parser

Free online iCal parser — parse .ics iCalendar file content into event details instantly in your browser. No data is stored. Extracts title, dates, location, and description.

vCard Generator

Free online vCard generator — create vCard (.vcf) contact file content instantly in your browser. No data is stored. Supports name, email, phone, address, organization, and website fields.

vCard Parser

Free online vCard parser — parse vCard (.vcf) contact file content into structured data instantly in your browser. No data is stored. Extracts name, email, phone, organization, and title.