What Day of the Week Is Any Date? (Weekday Calculator)

Enter any date to find its weekday, week number, and optional holiday info.

This Weekday Calculator instantly tells you the day of the week for any date — past, present, or future. Just enter a date to see whether it falls on a Monday, Tuesday, or any other weekday. The tool also shows the ISO week number, US week number, and optional information about US federal holidays that fall on or near that date. It’s ideal for historical research, event planning, school projects, payroll scheduling, or simply checking what day a specific date lands on. With clean results and accurate calculations, this weekday finder helps you understand and compare dates with ease.

Enter any date to find its weekday, week number, and see if it is a U.S. holiday.

Looking for official holiday explanations? Visit our U.S. holiday guide .