What week of the year is January 15, 2026?

Week 3

ISO week of 2026

Jan 12 – Jan 18, 2026

Week details

W3ISO week
Jan 12week starts (Mon)
Jan 18week ends (Sun)
53weeks in 2026
3rdweek of the month
Q1quarter
Thursdayweekday
266days since week started

Which week is it?

Thursday, January 15, 2026 falls in ISO week 3 of 2026. That week runs from Monday Monday, January 12, 2026 to Sunday Sunday, January 18, 2026, and it touches January. The ISO year 2026 has 53 weeks in total, so this is week 3 of 53, or about 6% 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 3 or a sprint that ends in week 5. The week began 266 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.

Nearby weeks

The week before is week 2, and the week after is week 4. 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 January 15, 2026?

ISO week 3 of 2026.

When does week 3 of 2026 start?

On Monday, Monday, January 12, 2026.

When does week 3 of 2026 end?

On Sunday, Sunday, January 18, 2026.

How many weeks are in 2026?

53 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 3rd week of the month, counting by seven-day blocks from the 1st.

RESULT & PLANNING

Use this calculation

What Week Is January 15, 2026?: Week 3 ISO week of 2026 — Jan 12 – Jan 18, 2026

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

263Calendar days
187Weekdays
38Saturdays
38Sundays
Not included unless this calculator says otherwisePublic holidays

Practical planning milestones

  1. Calculated dateThursday, January 15, 2026

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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