Calendar
Find the right tool for your next date, deadline or countdown.
Day of the Week
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Day of the Year
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
ISO Week Number
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Leap Year Calculator
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Days in a Year
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Days in a Month
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Weeks in a Year
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Weekdays in a Year
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Weekend Days in a Year
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Days Remaining in the Year
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Calendar Generator
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Birthstone Calculator
Find the traditional birthstone associated with a birth month.
Nth Weekday of a Month
Find the first, second, third, fourth, fifth or last occurrence of a weekday in a chosen month.
Last Weekday of a Month
Find the last Monday, Tuesday or other selected weekday in any Gregorian month.
Next Leap Year Calculator
Find the next leap year on or after a selected year and inspect the century exceptions.
Leap Years Between Years
List all Gregorian leap years within an inclusive start-year and end-year range.
Quarter Calculator
Find the quarter, quarter boundaries and day position for a date, with a selectable fiscal-year start.
Quarter Start & End Dates
Look up the first and last calendar dates of the quarter containing your selected date.
Year Progress Calculator
See the share of a calendar year completed before a selected date, with day totals and remaining dates.
Month Progress Calculator
See the share of a calendar month completed before a selected date and its exact day count.
ISO Week Date Converter
Convert an ISO week-year, week number and Monday-to-Sunday weekday to a calendar date.
Day of Year to Date Converter
Convert a year and ordinal day number into a validated calendar date.
Keep exploring
View the tool libraryDays Between Dates
Compare two dates with calendar days, complete weeks and weekday counts. Choose whether to include the end date.
Business Days Calculator
Count working days using your weekend pattern and optional excluded dates. Public holidays are excluded only when entered.
Day of the Week
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Time Zone Converter
Convert an exact UTC instant to another IANA time zone.
