Weeks Between Dates Calculator (Free Instant)

ISO 8601 is an international standard for date and time that defines how weeks are numbered globally. Under this standard: a week always starts on Monday。

and weeks are numbered from 01 to 52 or 53. This standard is used in business planning。

international logistics， and project management tools. Some countries start the week on Sunday instead of Monday. The US， the first week of the year is the week that contains the first Thursday of January， and several others follow this convention. ， Canada，。