fix(outputs-ui): correct weekly data formatting to support 53-week years

(cherry picked from commit 70bd975)

docs/CHANGELOG.md

@@ -16,6 +16,7 @@ v2.16.8 (2024-04-19)
 * **variants:** avoid recursive error when creating big variant tree [`#1967`](https://github.com/AntaresSimulatorTeam/AntaREST/pull/1967)
 * **outputs:** build outputs config even when using cache [`#1958`](https://github.com/AntaresSimulatorTeam/AntaREST/pull/1958)
 * **comments:** use a command to update comments on a variant [`#1959`](https://github.com/AntaresSimulatorTeam/AntaREST/pull/1959)
+* **outputs (ui):** correct weekly data formatting to support 53-week years [`#1975`](https://github.com/AntaresSimulatorTeam/AntaREST/pull/1975)
 
 
 v2.16.7 (2024-03-05)

webapp/src/components/App/Singlestudy/explore/Results/ResultDetails/index.tsx

@@ -158,19 +158,23 @@ function ResultDetails() {
       return ["Annual"];
     }
 
+    // Directly use API's week index (handles 53 weeks) as no formatting is required.
+    // !NOTE: Suboptimal: Assumes API consistency, lacks flexibility.
+    if (timestep === Timestep.Weekly) {
+      return matrixRes.data.index.map((weekNumber) => weekNumber.toString());
+    }
+
     // Original date/time format mapping for moment parsing
     const parseFormat = {
       [Timestep.Hourly]: "MM/DD HH:mm",
       [Timestep.Daily]: "MM/DD",
-      [Timestep.Weekly]: "WW",
       [Timestep.Monthly]: "MM",
     }[timestep];
 
     // Output formats for each timestep to match legacy UI requirements
     const outputFormat = {
       [Timestep.Hourly]: "DD MMM HH:mm  I",
       [Timestep.Daily]: "DD MMM  I",
-      [Timestep.Weekly]: "WW",
       [Timestep.Monthly]: "MMM",
     }[timestep];