fix: handle iso date strings

lib/utils/__tests__/dateHandling.test.ts

@@ -7,6 +7,8 @@ test.each([
   ['12 oktober 2020', '2020-10-11T22:00:00.000Z'],
   ['5 oktober 2020 11:34', '2020-10-05T09:34:00.000Z'],
   ['15 oktober 2020 11:34', '2020-10-15T09:34:00.000Z'],
+  ['2020-12-18T15:59:46.34', '2020-12-18T14:59:46.340Z'],
+  ['2020-12-18T15:59:46.340Z', '2020-12-18T15:59:46.340Z'],
   ['This is an invalid date', undefined],
 ])('handles date parsing of %s', (input, expected) => {
   expect(parseDate(input)).toEqual(expected)

lib/utils/dateHandling.ts

@@ -4,6 +4,8 @@ const options = {
   locale: 'sv',
 }
 
+const toISOString = (date: DateTime) => date.toUTC().toISO()
+
 export const parseDate = (input?: string): string | undefined => {
   if (!input) {
     return undefined
@@ -12,28 +14,34 @@ export const parseDate = (input?: string): string | undefined => {
   const dateParse = (format: string) =>
     DateTime.fromFormat(input, format, options)
 
+  const dateISO = DateTime.fromISO(input)
+
+  if (dateISO.isValid) {
+    return toISOString(dateISO)
+  }
+
   const dateAndTime = dateParse('yyyy-MM-dd HH:mm')
 
   if (dateAndTime.isValid) {
-    return dateAndTime.toUTC().toISO()
+    return toISOString(dateAndTime)
   }
 
   const onlyDate = dateParse('yyyy-MM-dd')
 
   if (onlyDate.isValid) {
-    return onlyDate.toUTC().toISO()
+    return toISOString(onlyDate)
   }
 
   const dateLongForm = dateParse('d MMMM yyyy')
 
   if (dateLongForm.isValid) {
-    return dateLongForm.toUTC().toISO()
+    return toISOString(dateLongForm)
   }
 
   const dateTimeLongForm = dateParse('d MMMM yyyy HH:mm')
 
   if (dateTimeLongForm.isValid) {
-    return dateTimeLongForm.toUTC().toISO()
+    return toISOString(dateTimeLongForm)
   }
 
   // Explicit return to satisfy ESLint