What week of the year is May 1, 2027?

Week 17

ISO week of 2027

Apr 26 – May 2, 2027

Week details

W17ISO week
Apr 26week starts (Mon)
May 2week ends (Sun)
52weeks in 2027
1stweek of the month
Q2quarter
Saturdayweekday
202days until week starts

Which week is it?

Saturday, May 1, 2027 falls in ISO week 17 of 2027. That week runs from Monday Monday, April 26, 2027 to Sunday Sunday, May 2, 2027, and it touches April and May. The ISO year 2027 has 52 weeks in total, so this is week 17 of 52, or about 33% of the way through the ISO year.

How ISO week numbers work

ISO 8601 weeks begin on Monday, and week 1 is the week that contains the first Thursday of the year. Because of that rule, the first days of January can belong to the last week of the previous year and the last days of December can belong to week 1 of the next. Most years have 52 weeks; roughly every five or six years a 53rd week is added to keep the count aligned with the seasons.

Planning by week

Schedules in manufacturing, logistics, education and project management are often written in week numbers, for example a delivery in week 17 or a sprint that ends in week 19. The week starts in 202 days, so there is time to plan. Keep in mind that US calendars often start the week on Sunday and use a different rule for week 1, so week numbers can differ between countries.

Nearby weeks

The week before is week 16, and the week after is week 18. The year pages list every week with its date range, and the week-number pages link to each of them.

Frequently asked questions

What week number is May 1, 2027?

ISO week 17 of 2027.

When does week 17 of 2027 start?

On Monday, Monday, April 26, 2027.

When does week 17 of 2027 end?

On Sunday, Sunday, May 2, 2027.

How many weeks are in 2027?

52 ISO weeks.

Which day starts the ISO week?

Monday.

What defines week 1?

The week containing the first Thursday of the year.

Can a date in January belong to the previous year's week?

Yes, when January 1 to 3 fall before the first Thursday.

What week of the month is it?

The 1st week of the month, counting by seven-day blocks from the 1st.

RESULT & PLANNING

Use this calculation

What Week Is May 1, 2027?: Week 17 ISO week of 2027 — Apr 26 – May 2, 2027

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.

Working days and weekends

207Calendar days
148Weekdays
30Saturdays
29Sundays
Not included unless this calculator says otherwisePublic holidays

Practical planning milestones

  1. Calculated dateSaturday, May 1, 2027

Accuracy and limitations

  • The result uses the calendar rules and time zone shown on this page.
  • Leap years and actual month lengths are handled by the calendar arithmetic where they affect the calculation.

Save or share this result

Calculation history

Machine-readable result
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