June 4, 2026 was a Thursday — the 4th of June, 2026. It was day 155 of 2026 and ISO week 23. 210 days remained in the year.
How the day-of-week calculator works
We use an adaptation of Zeller's congruence, a formula published in 1882 by Christian Zeller. It works for any date in the Gregorian calendar (October 15, 1582 to present, plus the proleptic Gregorian back to year 1).
Zeller's formula (Gregorian)
h = (q + ⌊13(m+1)/5⌋ + K + ⌊K/4⌋ + ⌊J/4⌋ - 2J) mod 7Where: h = day of week (0=Saturday), q = day of month, m = month (3=March, ..., 14=February), K = year of century, J = zero-based century. The same algorithm powers Windows, macOS, and Linux calendar applications.
Date facts
| Property | Value |
|---|---|
| Day of week | Thursday |
| Day of month | 4 |
| Month | June |
| Year | 2026 |
| Day of year | 155 of 365 |
| ISO week | 23 |
| Days remaining in year | 210 |
| Is leap year | No |
💡 Did you know? The names of the days come from ancient mythology and astronomy: Sunday (Sun), Monday (Moon), Tuesday (Tyr/Norse Mars), Wednesday (Woden/Odin), Thursday (Thor/Jupiter), Friday (Frigg/Venus), Saturday (Saturn). Romance languages preserve the planetary names more clearly: lunes, martes, miércoles, jueves, viernes, sábado, domingo.
Frequently Asked Questions
June 4, 2026 was a Thursday.
Enter your birthdate above and our calculator will tell you which day of the week you were born on. Try famous dates too — Martin Luther King Jr. Day is always the 3rd Monday of January.
We use the same algorithm as most calendar software: an adaptation of Zeller's congruence, which works for any date in the Gregorian calendar (from October 15, 1582 onward). For dates before 1582, the Julian calendar was in use.
The ISO week date system defines week 1 as the week containing the year's first Thursday. Weeks run Monday to Sunday. ISO week numbers go from 1 to 52 or 53, depending on the year.
July 4, 1776 was a Thursday. The Declaration of Independence was signed on a Thursday. Use the form above to verify or look up other historical dates.
The Apollo 11 moon landing (July 20, 1969) was on a Sunday. Neil Armstrong stepped onto the lunar surface at 10:56 PM Eastern time. Use the form above to look up the day of the week for any space-mission date.
In Excel: =TEXT(A1, "dddd") returns the full day name. =WEEKDAY(A1, 2) returns 1-7 with Monday=1. =ISOWEEKNUM(A1) returns the ISO week number. Google Sheets uses the same functions.
Friday the 13th occurs 1-3 times per year. The most recent was [varies]. Use our Recurring Date Calculator to find the next occurrence of any weekday + day-of-month combination.