Merge pull request #855 from CodeWithCJ/dev

date shift issue fix

Author: CodeWithCJ

SparkyFitnessFrontend/src/contexts/PreferencesContext.tsx

@@ -345,7 +345,11 @@ export const PreferencesProvider: React.FC<{ children: React.ReactNode }> = ({
 
       if (typeof date === 'string') {
         // If it's a full ISO string with time (e.g. 2026-02-16T...), keep it as is for parseISO
-        if (date.match(/^\d{4}-\d{2}-\d{2}$/) || date.includes('T00:00:00')) {
+        if (
+          date.match(/^\d{4}-\d{2}-\d{2}$/) ||
+          date.includes('T00:00:00') ||
+          (date.endsWith('Z') && date.includes('T00:00'))
+        ) {
           // IMPORTANT: Treat YYYY-MM-DD as a literal local date to avoid UTC-to-Local shifting.
           const datePart = date.split('T')[0];
           if (datePart) {
@@ -389,6 +393,22 @@ export const PreferencesProvider: React.FC<{ children: React.ReactNode }> = ({
         loggingLevel,
         `PreferencesProvider: Parsing date string "${dateString}".`
       );
+
+      // Handle literal date strings (YYYY-MM-DD or DB DATE format) to prevent shifting
+      if (
+        dateString.match(/^\d{4}-\d{2}-\d{2}$/) ||
+        dateString.includes('T00:00:00') ||
+        (dateString.endsWith('Z') && dateString.includes('T00:00'))
+      ) {
+        const datePart = dateString.split('T')[0];
+        if (datePart) {
+          const [year, month, day] = datePart.split('-').map(Number);
+          if (year && month && day) {
+            return new Date(year, month - 1, day);
+          }
+        }
+      }
+
       const parsedDate = parseISO(dateString);
       return startOfDay(parsedDate);
     },