Someone says, “Let’s schedule this for Week 23.”

You: “Week 23? What date is that?”

Them: “Just check the week number.”

You: Confused in calendar.

The Solution

This calculator tells you the ISO week number for any date. Plus, it shows you which dates that week covers.

How to Use It

Step 1: Select a Date Pick any date you want to check (defaults to today).

Step 2: Click “Get Week Number” One button. Done.

Step 3: Read Your Results You get:

• Week number (e.g., Week 45)
• Full date formatted
• Day of the week
• Day of the year (e.g., Day 312)
• Week start date (Monday)
• Week end date (Sunday)
• Total weeks in that year

Use Cases

• Project managers: Scheduling by week numbers
• Accountants: Organizing financial weeks
• Manufacturers: Tracking production weeks
• Logistics: Planning weekly shipments
• Fitness people: Tracking workout week numbers

Why Some Companies Use Week Numbers

It’s cleaner. Instead of saying “the week of March 17th to March 23rd,” they just say “Week 12.” Especially useful for:

• Production schedules
• Payroll periods
• Quarterly planning
• Delivery timelines

The Win

When someone mentions a week number, you can instantly translate it to actual dates. No more confusion in meetings.