Corrected a problem where workouts would be scheduled on the day before. Timezone issue

backend/cal_app.py

 from flask import Flask, Blueprint, jsonify, request, send_from_directory
-from flask_mysqldb import MySQL
+#from flask_mysqldb import MySQL
 from flask_sqlalchemy import SQLAlchemy
 from sqlalchemy import text
 from datetime import timedelta

calendar/src/calendar.js

@@ -31,14 +31,14 @@ changeCurrentDay = (day) => {
         currentDay: newDate,
         isModalOpen: true,
      },
-     () => this.fetchWorkoutsForDate(newDate.toISOString().split('T')[0])
+     () => this.fetchWorkoutsForDate(newDate.toLocaleDateString('sv-SE'))
     );
      
   };
 
 componentDidMount() {
     // Fetch workouts for today on load
-    const today = new Date().toISOString().split('T')[0];
+    const today = new Date().toLocaleDateString('sv-SE');
     this.fetchWorkoutsForDate(today);
 }
 
@@ -52,7 +52,7 @@ submitWorkout = async () => {
     const workoutData = {
         user_id: 1,
         activity_id: 1,
-        schedule_date: currentDay.toISOString().split('T')[0],
+        schedule_date: currentDay.toLocaleDateString('sv-SE'),
         start_time: startTime,
         end_time: endTime,
         activity_name: workout
@@ -71,7 +71,7 @@ submitWorkout = async () => {
 
         const result = await response.json();
         console.log('Workout saved:', result);
-        this.fetchWorkoutsForDate(currentDay.toISOString().split('T')[0]);
+        this.fetchWorkoutsForDate(currentDay.toLocaleDateString('sv-SE'));
     } catch (error) {
         console.error('Error saving workout:', error);
     }