Quick answer: 6 November 2026 is a Friday: it is day 310 of 2026, in ISO week 45, and falls on 26 Jumada al-Ula 1448 AH.
How it's calculated
The weekday is worked out with Zeller's congruence: h = (q + ⌊13(m + 1)/5⌋ + K + ⌊K/4⌋ + ⌊J/4⌋ + 5J) mod 7, where q is the day of the month, m the month (March = 3 … with January and February counted as months 13 and 14 of the previous year), K the year within the century and J the century. h = 0 is Saturday, 1 Sunday, and so on.
The ISO week follows ISO 8601: weeks start on Monday, and week 1 is the week that contains the year's first Thursday, so the first days of January can belong to the last week of the year before. The Hijri date uses the Umm al-Qura calendar.
To count the days between two dates use days between two dates, and for Hijri conversions Gregorian to Hijri.
Worked examples
- 6 November 2026: q = 6, m = 11, K = 26, J = 20 → h = 6 → Friday
- 1 January 2000: q = 1, m = 13, K = 99, J = 19 → h = 0 → Saturday
Frequently asked questions
What day of the week was I born?
Enter your date of birth. For your age in years, months and days, use the age calculator.
Why does the ISO week number differ from my calendar?
Calendars that start the week on Sunday or Saturday may number weeks differently. ISO 8601 weeks start on Monday and week 1 contains the first Thursday of the year.
Does the weekday repeat every year?
A date moves forward one weekday each year, or two after 29 February. The whole calendar repeats every 400 years.
How does a leap year change the weekday?
A date normally moves one weekday later each year, but two after a leap day. A year is a leap year if it divides by 4, except century years that don't divide by 400.
What day was 1 January 2000?
A Saturday. You can enter any date to check it, including your birthday or a future appointment.
Does it also show the Hijri date?
Yes. The result gives the matching Hijri date along with the day of the year and the ISO week number.