You can see the current week number of the week in the current year.
This applications shows the week date. You may be looking for: Week, Week-day names, or Week number.
Week counting depends on the time zone chosen in the time settings of your device! The ISO week-numbering year starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year (hence without overlap or gap). It consists of 52 or 53 full weeks.