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DeWelopeTools

ISO Week Date Converter

Convert between ISO 8601 week dates (e.g., 2024-W01-1) and standard calendar dates. Supports both directions with day-of-week display.

How to Use ISO Week Date Converter

The ISO Week Date Converter translates between ISO 8601 week dates (format: YYYY-Www-D) and standard calendar dates. Convert a calendar date to its ISO week representation, or enter an ISO year, week number (1-53), and day (1=Monday through 7=Sunday) to find the corresponding calendar date. ISO week dates are used in business planning, project management, manufacturing schedules, and international standards where week-based dating is preferred over month-based dating.

Step-by-Step Instructions

  1. Select conversion direction (calendar to ISO or ISO to calendar)
  2. Enter a calendar date or ISO year/week/day values
  3. Click Convert to see the result
  4. View the ISO week date, calendar date, and day of week

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