Dates & Time

Create a text calendar for any month and year

Compute time remaining until any target date

Create a sequence of dates between start and end dates

Explain cron expressions in human-readable form

Add up total hours worked from a list of clock in and clock out times, with breaks and overtime at 1.5x

Browse all major IANA timezone names with current local times

Compute exact age from birthdate

Compute rate limiting parameters and conversions

Work out sunrise, sunset, solar noon and day length in UTC for a latitude, longitude and date

Parse any time string format into hours, minutes

Find how many days are in any month

Check cron expression syntax for errors

Find the ISO week number for a date, or the dates a given ISO week covers

Convert milliseconds to human-readable duration

Compute the gap between two dates in years, months, weeks, and days

Work out the phase of the moon, its illumination and the next full and new moon for a date

Parse VEVENT fields or generate one RFC 5545 iCalendar event

View current time in multiple cities around the world

Determine the fiscal quarter for any date

Work out the hours and minutes between two times, including a shift that crosses midnight

Convert between 12-hour and 24-hour time formats

Format dates using custom patterns like YYYY-MM-DD HH:mm:ss

Get the ISO week number for any date

Add and subtract time durations in HH:MM:SS format

Find the day number within the year for any date

Compute time intervals, frequencies, and execution counts

Check if any year is a leap year with detailed explanation

Add or subtract days, months, and years from any date

Convert dates to human-readable relative format like '2 days ago'

Count business days between two dates

Set a browser alarm for the next local clock time with countdown and snooze

Parse ISO date-time input and inspect normalized calendar and epoch values