Calendar Date & Time

Browse free calendar date & time tools and utilities.

Available Tools

Week Number Calculator

Find the ISO week number and calendar week details for a selected date.

Day of Week Calculator

Find which weekday a selected date falls on.

Days Until Calculator

Count the number of days until a selected date or event.

Add Days to Date

Add or subtract calendar days from a selected date.

Julian Date Converter

Convert between standard calendar dates and Julian date values.

Ordinal Date Converter

Convert between calendar dates and ordinal dates such as year plus day of year.

Leap Year Checker

Check whether a selected year is a leap year.

Fiscal Year Calculator

Find the fiscal year, fiscal quarter, and fiscal period for a selected date.

Quarter Calculator

Find the calendar quarter, quarter start date, quarter end date, and remaining days.