fix(mssql): update is_date function

Author: aarthy-dk

testgen/template/flavors/mssql/profiling/templated_functions.yaml

@@ -3,44 +3,45 @@ IS_NUM: CASE
             ELSE 0
         END
 
-IS_DATE:    CASE WHEN TRY_CAST(NULLIF({$1}, '') AS float) IS NOT NULL
-                    AND LEFT(NULLIF({$1}, ''),4) BETWEEN 1800 AND 2200 THEN
-                 CASE
-                        WHEN LEN((NULLIF({$1}, ''))) > 11 THEN 0
-                        /* YYYYMMDD */
-                        WHEN TRY_CONVERT(DATE, NULLIF({$1}, ''), 112) IS NOT NULL THEN 1
-
-                        /* YYYY-MM-DD */
-                        WHEN TRY_CONVERT(DATE, NULLIF({$1}, ''), 23) IS NOT NULL THEN 1
-
-                        /* MM/DD/YYYY */
-                        WHEN TRY_CONVERT(DATE, NULLIF({$1}, ''), 101) IS NOT NULL THEN 1
-
-                        /* MM/DD/YY */
-                        WHEN TRY_CONVERT(DATE, NULLIF({$1}, ''), 1) IS NOT NULL THEN 1
-
-                        /*MM-DD-YYYY */
-                        WHEN TRY_CONVERT(DATE, NULLIF({$1}, ''), 110) IS NOT NULL THEN 1
-
-                        /*MM-DD-YY */
-                        WHEN TRY_CONVERT(DATE, NULLIF({$1}, ''), 10) IS NOT NULL THEN 1
-
-
-                   ELSE 0 END
-              /*DD MMM YYYY */
-               WHEN (TRY_CONVERT(DATE, NULLIF({$1}, ''), 106) IS NOT NULL
-                   AND LEFT(NULLIF({$1}, ''), 4)  BETWEEN 1800 AND 2200)
-                   THEN 1
-
-              /* YYYY-MM-DD HH:MM:SS SSSSSS */
-               WHEN (TRY_CONVERT(DATETIME2, NULLIF({$1}, ''), 121) IS NOT NULL
-                   AND LEFT(NULLIF({$1}, ''), 4)  BETWEEN 1800 AND 2200)
-                   THEN 1
-
-              /* YYYY-MM-DD HH:MM:SS */
-               WHEN (TRY_CONVERT(DATETIME2, NULLIF({$1}, ''), 120) IS NOT NULL
-                   AND LEFT(NULLIF({$1}, ''), 4)  BETWEEN 1800 AND 2200)
-                   THEN 1
-              ELSE 0
-              END
-
+IS_DATE: |- 
+          CASE
+            WHEN NULLIF(LTRIM(RTRIM({$1})), '') IS NULL THEN 0
+            WHEN (
+                COALESCE(
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 112), /* YYYYMMDD  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 23),  /* YYYY-MM-DD  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 101), /* MM/DD/YYYY  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 1),   /* MM/DD/YY (2-digit year windowing)  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 110), /* MM-DD-YYYY  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 10),  /* MM-DD-YY (2-digit year windowing)  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 106), /* DD MMM YYYY  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 107), /* MMM dd, YYYY */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 126), /* ISO 8601 no TZ: YYYY-MM-DDTHH:MM:SS[.fff]  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 120), /* YYYY-MM-DD HH:MM:SS  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 121), /* YYYY-MM-DD HH:MM:SS.mmm  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 111), /* YYYY/MM/DD  */
+                  TRY_CONVERT(datetime2, LTRIM(RTRIM({$1})), 102), /* YYYY.MM.DD  */
+                  /* Normalize "YYYY-MM-DD HH:MM:SS SSSSSS" -> ISO 8601 with 'T' and '.' */
+                  TRY_CONVERT(
+                    datetime2,
+                    CASE
+                      WHEN LTRIM(RTRIM({$1})) LIKE
+                           '[0-9][0-9][0-9][0-9]-[0-1][0-9]-[0-3][0-9] [0-2][0-9]:[0-5][0-9]:[0-5][0-9] [0-9]%'
+                      THEN
+                        /* Replace DT space (pos 11) with 'T', and the last space with '.' */
+                        STUFF(
+                          STUFF(LTRIM(RTRIM({$1})), 11, 1, 'T'),
+                          LEN(LTRIM(RTRIM({$1}))) - CHARINDEX(' ', REVERSE(LTRIM(RTRIM({$1})))) + 1,
+                          1,
+                          '.'
+                        )
+                      ELSE LTRIM(RTRIM({$1}))
+                    END,
+                    126
+                  )) BETWEEN '1800-01-01T00:00:00' AND '2200-12-31T23:59:59.9999999' )
+              OR (  /* ISO 8601 with timezone: style 127 parsed as datetimeoffset, then cast */
+                  CAST(TRY_CONVERT(datetimeoffset, LTRIM(RTRIM({$1})), 127) AS datetime2)
+                  BETWEEN '1800-01-01T00:00:00' AND '2200-12-31T23:59:59.9999999' )
+            THEN 1
+            ELSE 0
+          END