Empty timezone is UTC assumed for compatibility reasons with 'TestSet…

…Duration' due to the way time.Parse(time.RFC822Z, time.RFC822Z) works

components.go

@@ -197,7 +197,7 @@ func dateFormatForTime(t time.Time, props []PropertyParameter) (string, []Proper
 	if l != nil {
 		ls = l.String()
 	}
-	if (l == time.UTC /* || ls == "MST"*/ || l == nil) && tzid == nil {
+	if (l == time.UTC /* || ls == "MST"*/ || ls == "") && tzid == nil {
 		layout = icalDateFormatUTC
 	} else if tzid == nil && l != time.Local /* && ls != "MST"*/ {
 		props = append(props, WithTZID(ls))
@@ -213,7 +213,7 @@ func timestampFormatForTime(t time.Time, props []PropertyParameter) (string, []P
 	if l != nil {
 		ls = l.String()
 	}
-	if (l == time.UTC || /*ls == "MST" ||*/ l == nil) && tzid == nil {
+	if (l == time.UTC || /*ls == "MST" ||*/ ls == "") && tzid == nil {
 		layout = icalTimestampFormatUTC
 	} else if tzid == nil && l != time.Local /* && ls != "MST"*/ {
 		props = append(props, WithTZID(ls))

components_test.go

@@ -11,7 +11,7 @@ import (
 )
 
 func TestSetDuration(t *testing.T) {
-	date, _ := time.Parse(time.RFC822, time.RFC822)
+	date, _ := time.Parse(time.RFC822Z, time.RFC822Z)
 	duration := time.Duration(float64(time.Hour) * 2)
 
 	testCases := []struct {
@@ -181,7 +181,7 @@ END:VEVENT
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 
-			if dateSpecificLocationNotLocal.Location().String() == "MST" {
+			if tc.start.Location().String() == "MST" || tc.end.Location().String() == "MST" {
 				t.Skipf("No idea why we are getting MST -- Help?")
 			}