Week 4 of 2025 runs January 20, 2025 to January 26, 2025.
Week 4 starts on Monday, January 20, 2025 and ends on Sunday, January 26, 2025. It's the 20th day of the year, sits in Q1, and falls in January. By the end of this week, 26 of 365 days are gone, putting 2025 at 7.1%.
This week includes Australia Day, so it has 5 working days instead of the usual 5. Need a different week? Browse the full 2025 week calendar, or jump to this week's number.
Week 4 at a glance
The 7 days of week 4
Every date in week 4 of 2025, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 20 | Weekday | ||
| Tuesday | Day 21 | Weekday | ||
| Wednesday | Day 22 | Weekday | ||
| Thursday | Day 23 | Weekday | ||
| Friday | Day 24 | Weekday | ||
| Saturday | Day 25 | Weekend | ||
| Sunday | Day 26 | Weekend | Australia Day |
What week 4 of 2025 means
ISO 8601 numbers weeks so every week starts on Monday and ends on Sunday. Week 1 is the one holding the year's first Thursday, which is why early January can land in week 52 or 53 of the previous year. Week 4 is one piece of that system.
In 2025, week 4 covers Jan 20 – Jan 26, 2025. That's January, deep in Q1. The same week number shifts by a day or two each year, so week 4 in 2026 won't share these exact dates. The table below shows how it moves.
Want to check a specific date instead of a week number? The week calculator converts any date to its ISO week. Curious how many weeks a year holds? The weeks in a year guide explains 52 versus 53. And the ISO week number page covers the standard end to end.
Holidays in week 4 of 2025
🇺🇸 United States
🇦🇺 Australia
Australia Day
NationalWeek 4 across years
The same ISO week number lands on different dates each year. Here's how week 4 shifts.
Week 4 of 2025: questions and answers
What days are in week 4 of 2025?
Week 4 of 2025 runs from January 20, 2025 (Monday) through January 26, 2025 (Sunday). It spans January.
What month is week 4 in 2025?
Week 4 of 2025 falls entirely in January 2025.
How many working days are in week 4 of 2025?
Week 4 of 2025 has 5 working days.
What week is Australia Day in 2025?
Australia Day falls in ISO week 4 of 2025 (Jan 20 – Jan 26, 2025).
What quarter is week 4 of 2025 in?
Week 4 of 2025 is in Q1 (2025). The week starts on day 20 of 365.
What is ISO week 4?
ISO week 4 is defined by the ISO 8601 international standard. It begins on Monday, January 20, 2025, and ends on Sunday, January 26, 2025. It is week 8% through the ISO year 2025.