How this calculation was worked out
The result uses the exact inputs on this page and calendar/time arithmetic appropriate to this calculator. The result shown above is the value to use for this calculation.
May 15, 2026 144 days agoWhat day of the week is May 15, 2026?
Calendar position
Friday, May 15, 2026 falls on a Friday. It is day 135 of 365 in 2026, in ISO week 20, in quarter 2 and in spring in the northern hemisphere. The date is 144 days ago, and it is a weekday, so offices and schools are normally open. It does not coincide with any of the major holidays tracked on this site that year. On May 15, 2026 the moon is a Waning Crescent with about 2% of its disc lit, roughly 28 days after the previous new moon. That figure is computed from lunar phase formulas, not looked up, so it is available for any year in the range. The weekday of a date is found by counting the days from a known reference date and taking the remainder after dividing by seven. The calculator applies that rule to real Gregorian dates, including leap days, which is why it works equally well for a birth date in 1985 and a wedding date in 2032. Use the form above to check any other date, or open the neighbouring dates linked below.The answer in detail
The moon and the calendar
How weekday lookups work
It is a Friday. Day 135 of 365. Week 20 of 2026. Quarter 2 of 2026. No, it is a weekday (Friday). No. 144 days ago. Waning Crescent, about 2% illuminated.Frequently asked questions
What day of the week is May 15, 2026?
What day of the year is May 15, 2026?
What ISO week is it?
Which quarter is it in?
Is it a weekend?
Is 2026 a leap year?
How far away is the date?
What is the moon phase on that date?
What Day of the Week Is May 15, 2026?: Friday May 15, 2026 — 144 days ago
The result uses the exact inputs on this page and calendar/time arithmetic appropriate to this calculator. The result shown above is the value to use for this calculation.
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