Does this work for dates far in the past or future?

Yes, it works for any date representable by the Gregorian calendar, including dates before your country adopted it, though very old historical dates may not match the calendar actually in use at the time (such as the Julian calendar).

How does it decide whether a date is a weekend?

A date is flagged as a weekend if it falls on Saturday or Sunday, which is the most common convention, though some countries use a different weekend (like Friday-Saturday).

Day of the Week Calculator

Find out what day of the week any date falls on.

How this is calculated

Day of week = date.getDay()

Assumptions used in this calculation

Calendar: Uses the Gregorian calendar; Saturday and Sunday are treated as the weekend days.

About this calculator

The day of the week calculator tells you which day of the week a past, present or future date falls on, and whether it's a weekend.

Worked example

1 January 2026

Result: Thursday

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Frequently asked questions

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Find the number of days, weeks, months and years between two dates.

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Add or subtract days, weeks, months or years from a date.

Day of the Week Calculator

About this calculator

Frequently asked questions

Does this work for dates far in the past or future?

How does it decide whether a date is a weekend?

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