Date & Time

Date Difference Calculator

Calculate the exact number of days, months, and years between any two dates.

📅 Date & Time

Add or Subtract Days

Add or subtract days, weeks, months, or years from any date.

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Business Days Calculator

Calculate the number of business (working) days between two dates, excluding weekends.

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Age Calculator

Calculate your exact age in years, months, days, and more from your birthdate.

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Countdown Timer

Create a live countdown to any future date and time with days, hours, minutes, and seconds.

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Stopwatch

Online stopwatch with lap times, start/stop, and reset functionality.

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World Clock

View the current time in multiple cities and timezones around the world simultaneously.

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Timezone Converter

Convert any date and time between multiple timezones instantly.

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Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates in both directions.

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ISO 8601 Formatter

Format any date/time into ISO 8601 standard format with multiple variants.

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Date Format Converter

Convert dates between US, European, ISO, and other popular formats simultaneously.

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Calendar Generator

Generate a clean calendar view for any month and year with customizable week start.

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Week Number Calculator

Get the ISO week number for any date along with week ranges and quarter info.

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Day of Year Calculator

Find what day of the year (1-365) any date falls on, with a visual progress bar.

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Leap Year Checker

Check if any year is a leap year and see the mathematical rules explained.

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Moon Phase Calculator

Calculate the approximate moon phase for any date with illumination percentage.

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Sunrise & Sunset Calculator

Calculate approximate sunrise and sunset times for any location and date.

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Holiday Calendar

View major holidays for selected countries and years with date and type classification.

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Working Hours Calculator

Calculate total working hours from start/end times minus break duration.

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Time Duration Calculator

Calculate the duration between two times with optional date support for multi-day spans.

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Meeting Time Finder

Find overlapping working hours across multiple timezones for scheduling meetings.

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Epoch Converter

Convert epoch timestamps in seconds or milliseconds to human-readable dates with auto-detection.

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Cron Expression Generator

Build cron expressions visually with presets, field editors, and next-run previews.

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Cron Expression Parser

Parse and explain cron expressions in plain English with field breakdown and next runs.

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Date to Words

Convert any date into written words in multiple formal and informal formats.

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Relative Time Calculator

Show how long ago or how far in the future any date/time is, with live updating.

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Fiscal Quarter Calculator

Determine the fiscal quarter for any date with configurable fiscal year start month.

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Julian Date Converter

Convert between Julian Date numbers and Gregorian calendar dates.

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Gestational Age Calculator

Calculate gestational age and estimated due date from the last menstrual period.

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Chronological Age Calculator

Calculate precise chronological age with optional birth time for exact age in years, months, days.

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Time Card Calculator

Calculate hours and pay from multiple clock-in/out entries with overtime tracking.

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Shift Schedule Generator

Generate work shift schedules with configurable on/off patterns and calendar view.

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Date Range Generator

Generate a list of dates within a range with configurable step and format options.

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Recurring Date Calculator

Calculate dates for recurring events at daily, weekly, monthly, or yearly intervals.

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Sleep Calculator

Calculate optimal bedtimes or wake times based on 90-minute sleep cycles.

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