Date & Time

Calculate time differences and convert between different calendars.

Baha'i Next Birthday Weekday Finder

Free online tool — fast, accurate results in your browser.

Baha'i Half Birthday Calculator

Free online calculator with instant, accurate results.

Baha'i Add Business Days Calculator

Free online calculator with instant, accurate results.

Baha'i Quarter Finder

Free online tool — fast, accurate results in your browser.

World Clock & Time Zone Converter

Free online tool — instant, accurate conversions in your browser.

Interactive Event Countdown Timer

Free online tool — fast, accurate results in your browser.

About Date & Time

Our Date & Time calculators are designed to help you solve complex problems and get accurate results quickly.

Free Christian feast calculator. Find dates for fixed holidays like Christmas, Epiphany, and Annunciation for any year.

Free Easter-based holy days calculator. Calculate movable Christian dates like Ash Wednesday, Pentecost, and Ascension.

Free Coptic holy days calculator. Find dates for fixed and movable Coptic Orthodox feasts and religious occasions.

Free Jewish holidays calendar. Find dates for Hebrew feasts and fasts including Rosh Hashanah, Yom Kippur, and Passover.

Free Holy Week calculator. Find exact dates for Palm Sunday, Maundy Thursday, Good Friday, and Easter for any year.