lsWeek

Returns the week number in the year of the date referenced, based on the local influence.
Not everywhere does the week begin on Monday by definition.

lsWeek(date [, locale] [, timezone]) → returns numeric

This function requires Lucee.  Not supported on Adobe ColdFusion, etc.
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Argument Reference

date date
Required

date object; for example, now()

locale string
Default: getLocale()

Geographic/language locale value, where the format is a combination of an ISO 639-1 code and an optional ISO 3166-1 code separated by a dash or an underscore.
Values:
  • en
  • de-DE
  • de-CH
  • ...

timezone string

A datetime object is independent of a specific timezone; it is only an offset in milliseconds from 1970-1-1 00.00:00 UTC (Coordinated Universal Time).

The timezone can come into play for all dateparts. For example: 8:00 a.m. in Germany (= CET) is 11 p.m. the previous day in PST (pacific time zone). So it's important to keep in mind, that the same date can be on different dates in different timezones, not only hours may change.

A timezone must be specified in order to translate the date object to something else. If you do not provide the timezone in the function call, it will default to the timezone specified in the Lucee Administrator (Settings/Regional), or the timezone specified for the current request using the function setTimezone().

You can find a list of all available timezones in the Lucee administrator (Settings/Regional). Some examples of valid timezones include:

* AGT (for time in Argentina)
* Europe/Zurich (for time in Zurich/Switzerland)
* HST (Hawaiian Standard Time in the USA)

Links more information about lsWeek

Examples
Sample code invoking the lsWeek function 

WriteOutput( lsWeek( createDateTime( '2019', '10', '04', '01', '50', '00' ), 'en_US', 'CDT' ) );

Expected Result: 40

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