2010-W40
Week 40, 2010
Monday, October 4, 2010 – Sunday, October 10, 2010
Monday–Sunday
Sunday–Saturday convention on days in this range
Days in this week
| Weekday | Date | Day of year | Month | US week |
|---|---|---|---|---|
| Monday | October 4, 2010 | 277 | Calendar | 41 |
| Tuesday | October 5, 2010 | 278 | Calendar | 41 |
| Wednesday | October 6, 2010 | 279 | Calendar | 41 |
| Thursday | October 7, 2010 | 280 | Calendar | 41 |
| Friday | October 8, 2010 | 281 | Calendar | 41 |
| Saturday | October 9, 2010 | 282 | Calendar | 41 |
| Sunday | October 10, 2010 | 283 | Calendar | 42 |
Federal holidays this week
None of the US federal observed holidays fall in this ISO week.
Week 40 of 2010
ISO week 40 of 2010 (2010-W40) runs Monday, October 4, 2010 through Sunday, October 10, 2010. The full range is Oct 4 – Oct 10, 2010. Days follow the ISO Monday–Sunday convention. The US week label for dates in this window is 41–42.
Federal holidays in this window: No federal holidays. This week stays within a single calendar year. When a holiday shifts observance to a nearby weekday, the table shows the date offices actually close rather than the legal calendar date alone.
ISO vs US week labels
ISO weeks always start on Monday and end on Sunday. US week numbers on this site often follow a Sunday-start convention used in retail and broadcast schedules. Both labels appear on week pages so you can match internal reports that use either system. When the two disagree at year boundaries, the cross-year note on this page explains which label applies to each calendar day.
Day-by-day breakdown
The grid above lists all seven days with weekday names, calendar dates, and day-of-year numbers. That layout helps compare ISO week boundaries against month-end billing cycles or school weeks that start on Sunday. Each row links back to the parent year table for context. Payroll teams often map ISO weeks to pay periods even when checks are issued on a different weekday schedule.
Download an ICS calendar file for this week to import the date range into Outlook, Google Calendar, or Apple Calendar. The file contains one all-day event spanning Monday, October 4, 2010 through Sunday, October 10, 2010.
Navigate weeks and years
Use previous week and next week links to step through 2010 one ISO week at a time. Open the full 2010 week table to jump to any week number directly.
Printable yearly view
For a single sheet with all twelve months and week columns, download the 2010 yearly calendar PDF. Monthly detail with larger day cells is available from the monthly calendars hub when this week spans two different months.
Frequently asked questions
What dates are in week 40 of 2010?
ISO week 40 (2010-W40) runs Monday, October 4, 2010 through Sunday, October 10, 2010, Monday through Sunday. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.
What is the US week for this range?
Days in this ISO week map to US week 41–42 under the Sunday–Saturday convention. Individual days may differ near year boundaries. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.
Are there federal holidays this week?
No federal holidays. Observed federal dates are listed above with weekday labels. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.
Does this week cross calendar years?
ISO weeks can begin in the previous December or end in the next January. Note for this week: This week stays within a single calendar year. The day table above shows each calendar date. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.
How do I add this week to my calendar app?
Download the ICS file from this page. It creates an all-day event covering Monday through Sunday for 2010-W40. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.