Choose Conversion Mode Select 'Date to Week' or 'Week to Date' mode based on your needs.
Enter Query Input a date, or select a year and week number. Click 'Current Week' for today's info.
View Results Instantly see the ISO week number, week start/end dates, week progress, and more.
Project Management๏ผPlan project milestones and task schedules using ISO week numbers for consistent team communication.
Logistics & Supply Chain๏ผSchedule deliveries, warehouse rotations, and inventory cycles using standardized week numbers.
Education๏ผSchools and universities plan curricula, exam dates, and holidays using week numbers for coordination.
Financial Reporting๏ผFinance departments generate weekly revenue reports and compare performance across weeks and years.
ISO 8601 week numbering system: weeks start on Monday, and the first week of the year is the week containing the first Thursday. January 1 may belong to the last week of the previous year, and December 31 may belong to week 1 of the next year.
Click the 'Today' button to auto-fill today's date, or enter any date manually. The tool instantly shows the ISO week number, week start/end dates, and week progression.
If January 1 falls on Friday, Saturday, or Sunday, it belongs to the last week of the previous year per ISO 8601. Only Jan 1 on Monday-Thursday starts week 1 of the new year.
Yes. The tool automatically handles weeks that cross year boundaries. For example, week 1 of 2026 may start on December 29, 2025. All calculations follow ISO 8601 strictly.
Project planning, logistics scheduling, school curriculum planning, financial reporting, manufacturing scheduling, and international business coordination all use ISO week numbers for consistent weekly planning.