24 lines
546 B
Markdown
24 lines
546 B
Markdown
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# FC_GetWeekNumber
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## Description
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Calculates the **ISO 8601 week number** (week 1 = week containing first Thursday)
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Input: DT (DATE_AND_TIME)
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Output: UINT (1..53)
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## Features
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- Follows ISO 8601 rules (Monday week start)
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- Uses built-in Siemens functions (WEEKDAY, DAY_OF_YEAR)
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## Input / Output
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**Input**
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- `stDateTime` : DT Date/time value
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**Return**
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- UINT Week number 1..53
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## Usage example
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```iecst
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wCurrentWeek := "FC_GetWeekNumber"(stDateTime := #Now);
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IF wCurrentWeek = 1 THEN
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// New year logic...
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END_IF;
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