2025W05

2025W05 is the fifth week of the ISO week-numbering year 2025, a labeling scheme used in the ISO 8601 standard. In this system, weeks begin on Monday and end on Sunday. Because the ISO week-year can start in the previous calendar year, some early weeks of a given year may extend into the prior year; for example, 2025W01 began in December 2024.

For 2025, the fifth ISO week runs from Monday, January 27, 2025 to Sunday, February 2, 2025. This week lies in late January and early February, a period that corresponds to winter in the Northern Hemisphere.

The ISO week-date system is commonly used in computing, data analysis, and planning to standardize week-based representations across years and locales. It helps avoid ambiguities that can arise when different countries assign weeks differently in the Gregorian calendar. In practice, dates within 2025W05 can be referenced using the year and week number format (2025-W05) in many software libraries and scheduling tools.