mealplandialog date range working and moving

vue3/src/utils/date_utils.ts

@@ -0,0 +1,14 @@
+import {DateTime} from "luxon";
+
+/**
+ * shifts a range of dates/any array of dates by the number of days given in the day modifier (can be positive or negative)
+ * @param dateRange
+ * @param dayModifier
+ */
+export function shiftDateRange(dateRange: Date[], dayModifier: number){
+    let newDateRange: Date[] = []
+    dateRange.forEach(date => {
+        newDateRange.push(DateTime.fromJSDate(date).plus({'days': dayModifier}).toJSDate())
+    })
+    return newDateRange
+}