ISO week of 2026 Feb 23 – Mar 1, 2026What week of the year is March 1, 2026?
Week details
Sunday, March 1, 2026 falls in ISO week 9 of 2026. That week runs from Monday Monday, February 23, 2026 to Sunday Sunday, March 1, 2026, and it touches February and March. The ISO year 2026 has 53 weeks in total, so this is week 9 of 53, or about 17% of the way through the ISO year. 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. Schedules in manufacturing, logistics, education and project management are often written in week numbers, for example a delivery in week 9 or a sprint that ends in week 11. The week began 219 days ago. 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. The week before is week 8, and the week after is week 10. The year pages list every week with its date range, and the week-number pages link to each of them. Today is Wednesday, September 30, 2026. That is day 273 of 365 in 2026, in ISO week 40, with 92 days to go before the year ends. The next dates people plan around are Diwali on Saturday, October 10; Columbus Day on Monday, October 12; Halloween on Saturday, October 31. The moon is a Waning Gibbous tonight, with about 81% of its face lit. All of these figures are recalculated when the page loads, so they always describe the day you open it, not the day the page was published. The Gregorian calendar has twelve months of 28 to 31 days. A normal year has 365 days and a leap year has 366, with the extra day added to February in every year divisible by four except century years that are not divisible by 400. Because 365 is one more than 52 weeks, most dates move forward one weekday each year and two after a leap day. Weeks are numbered under ISO 8601, which starts weeks on Monday and gives week 1 to the week containing the first Thursday of January.Which week is it?
How ISO week numbers work
Planning by week
Nearby weeks
Today's date at a glance
How the calendar works
ISO week 9 of 2026. On Monday, Monday, February 23, 2026. On Sunday, Sunday, March 1, 2026. 53 ISO weeks. Monday. The week containing the first Thursday of the year. Yes, when January 1 to 3 fall before the first Thursday. The 1st week of the month, counting by seven-day blocks from the 1st. Quarter 1. Sunday. Not necessarily; many US calendars start weeks on Sunday and count differently. It started 219 days ago. Week 8. Yes. Use the form above.Frequently asked questions
What week number is March 1, 2026?
When does week 9 of 2026 start?
When does week 9 of 2026 end?
How many weeks are in 2026?
Which day starts the ISO week?
What defines week 1?
Can a date in January belong to the previous year's week?
What week of the month is it?
Which quarter is it in?
What day of the week is the date?
Is it the same week number in the US?
How many days until the week starts?
What is the previous week number?
Can I look up another date?