---
url: >-
  /statelake/scripting-reference/functions-and-procedures/datetime-functions/decodedateweek.md
---

# DecodeDateWeek

**DecodeDateWeek** reverse engineers a date **AValue**, and returns the date broken into its various component parts.

The parameters **AYear**, **AWeekOfYear**, and **ADayOfWeek** are populated with the parts of the date, so that you can then use the variables in your calculations.

This is the opposite of **EncodeDateWeek** [EncodeDateWeek](/statelake/scripting-reference/functions-and-procedures/datetime-functions/encodedateweek).

The definitions for **AWeekOfYear** and **ADayOfWeek** follow the ISO 8601 standard.

* **AYear** returns the year that **AValue** represents.
* **AWeekOfYear** returns the week within **AYear** that **AValue** represents, where 1 is the first week with four or more days.
* **ADayOfWeek** returns the day within **AWeekOfYear** that **AValue** represents, where 1 is Monday and 7 is Sunday.

**Declaration**: procedure DecodeDateWeek(const AValue: TDateTime; out AYear, AWeekOfYear, ADayOfWeek: Word);

Such as the example below.

```pascal
procedure OnMapEvent(var Value:Variant);
var
  aYear, aWeek, aDay : word;
begin
 //Break date/time into its individual parts
  DecodeDateWeek(Now, aYear, aWeek, aDay);

 if ((aWeek=3) and (aDay=7)) then

    ...do something at this special time...;

end;
```