1. What is Year To Date Week Number?

The Year To Date Week Number represents how many full weeks have passed since the start of the year (or any specified start date). It's useful for tracking progress, reporting, and planning in weekly increments.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Current Date — The date you want to evaluate
• Year Start Date — The reference start date (typically January 1st)
• ⌊ ⌋ — Floor function (rounding down to nearest integer)

Explanation: The calculator counts the number of full 7-day periods between the two dates, then adds 1 to make the count start at 1 instead of 0.

3. Importance of Week Number Calculation

Details: Tracking weeks year-to-date helps with project management, financial reporting, fitness tracking, and any activity where weekly progress needs to be measured against annual goals.

4. Using the Calculator

Tips:

• Enter the current date (defaults to today)
• Enter the year start date (defaults to January 1st of current year)
• The current date must be on or after the year start date

5. Frequently Asked Questions (FAQ)

Q1: How is this different from ISO week numbers?
A: ISO week numbers have specific rules about week 1 containing the year's first Thursday. This calculator simply counts full 7-day periods from your start date.

Q2: Can I use a custom start date?
A: Yes, you can set any start date - it doesn't have to be January 1st.

Q3: What if my date range spans less than 7 days?
A: The calculator will return week 1, as no full week has passed yet.

Q4: How are partial weeks handled?
A: Partial weeks at the end of the period are not counted - only complete 7-day periods are included.

Q5: Can I calculate weeks between any two dates?
A: Yes, though the calculator is designed for year-to-date calculations, it works for any date range where the end date is after the start date.