[FIX] format: wrong internal format conversion

In internal format, the "mm" of minutes is converted to "MM", to
be distinct from "mm" of months. But the conversion wasn't done
when converting back to a format string.

closes #7246

Task: 5126306
X-original-commit: 0aa0e39
Signed-off-by: Lucas Lefèvre (lul) <[email protected]>
Signed-off-by: Adrien Minne (adrm) <[email protected]>

Author: hokolomopo

src/helpers/format/format_parser.ts

@@ -284,7 +284,7 @@ function tokensToTextInternalFormat(
  * Replace in place tokens "mm" and "m" that denote minutes in date format with "MM" to avoid confusion with months.
  *
  * As per OpenXML specification, in date formats if a date token "m" or "mm" is followed by a date token "s" or
- * preceded by a data token "h", then it's not a month but an minute.
+ * preceded by a data token "h", then it's not a month but a minute.
  */
 function convertTokensToMinutesInDateFormat(tokens: DateInternalFormat["tokens"]) {
   const dateParts = tokens.filter((token) => token.type === "DATE_PART") as DatePartToken[];
@@ -332,6 +332,9 @@ function internalFormatPartToFormat(
       case "REPEATED_CHAR":
         format += "*" + token.value;
         break;
+      case "DATE_PART":
+        format += token.value === "MM" ? "mm" : token.value; // Convert "MM" back to "mm" for minutes
+        break;
       default:
         format += token.value;
     }

tests/formats/format_helpers.test.ts

@@ -1053,6 +1053,7 @@ describe("rounding format", () => {
     expect(roundFormat("ddd-mm-yyyy")).toBe("ddd-mm-yyyy");
     expect(roundFormat("#,##0,,")).toBe("#,##0,,");
     expect(roundFormat("#,##0.00,")).toBe("#,##0,");
+    expect(roundFormat("hh:mm:ss")).toBe("hh:mm:ss");
   });
 
   test("Round multi part format", () => {