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| 1 | +*=========================================================== |
| 2 | +* GetWeekdayNameFromString |
| 3 | +* Input : STRING containing a date or datetime |
| 4 | +* Accepted formats include: |
| 5 | +* YYYY-MM-DD |
| 6 | +* YYYY-MM-DD HH:MM:SS |
| 7 | +* (and any valid SetAsString format) |
| 8 | +* |
| 9 | +* Output: DIM full weekday name |
| 10 | +*=========================================================== |
| 11 | + |
| 12 | +GetWeekdayNameFromString LFUNCTION |
| 13 | +InStr DIM 40 |
| 14 | + ENTRY |
| 15 | + |
| 16 | +WKSTR DIM 2 |
| 17 | +WKNUM FORM 1 |
| 18 | +FullName DIM 10 |
| 19 | +RET FORM 2 |
| 20 | +TMPDT DATETIME |
| 21 | + |
| 22 | +*----------------------------------------------------------- |
| 23 | +* Load the incoming string into a DATETIME object |
| 24 | +* SetAsString handles standard date formats (see docs). |
| 25 | +*----------------------------------------------------------- |
| 26 | + TMPDT.SetAsString GIVING RET USING *Value=InStr |
| 27 | + |
| 28 | +* If SetAsString failed (RET ? 0), you may handle errors here. |
| 29 | +* But for simplicity, we proceed assuming valid input. |
| 30 | + |
| 31 | +*----------------------------------------------------------- |
| 32 | +* Extract weekday number 0�6 (Sunday=0) |
| 33 | +*----------------------------------------------------------- |
| 34 | + TMPDT.GetAsString GIVING WKSTR USING *Format="%w" |
| 35 | + MOVE WKSTR TO WKNUM |
| 36 | + |
| 37 | +*----------------------------------------------------------- |
| 38 | +* Map number to full weekday name |
| 39 | +*----------------------------------------------------------- |
| 40 | + SELECT USING WKNUM |
| 41 | + WHEN 0 |
| 42 | + MOVE "Sunday" TO FullName |
| 43 | + WHEN 1 |
| 44 | + MOVE "Monday" TO FullName |
| 45 | + WHEN 2 |
| 46 | + MOVE "Tuesday" TO FullName |
| 47 | + WHEN 3 |
| 48 | + MOVE "Wednesday" TO FullName |
| 49 | + WHEN 4 |
| 50 | + MOVE "Thursday" TO FullName |
| 51 | + WHEN 5 |
| 52 | + MOVE "Friday" TO FullName |
| 53 | + WHEN 6 |
| 54 | + MOVE "Saturday" TO FullName |
| 55 | + ENDSELECT |
| 56 | + |
| 57 | + FUNCTIONEND USING FullName |
| 58 | +*--------------------------------------- |
| 59 | +* Example: Convert a date string to |
| 60 | +* a full weekday name. |
| 61 | +*--------------------------------------- |
| 62 | + |
| 63 | +MyDateStr DIM 40 |
| 64 | +WDAYNAME DIM 10 |
| 65 | + |
| 66 | + MOVE "2025-12-25" TO MyDateStr |
| 67 | + |
| 68 | + CALL GetWeekdayNameFromString GIVING WDAYNAME USING MyDateStr |
| 69 | + |
| 70 | + DISPLAY *N,"Weekday is: ",WDAYNAME,*W4 |
| 71 | + STOP |
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