diff --git a/styles.go b/styles.go
index a701a69e4f..1ba9f08b1e 100644
--- a/styles.go
+++ b/styles.go
@@ -46,8 +46,8 @@ var builtInNumFmt = map[int]string{
 	17: "mmm-yy",
 	18: "h:mm am/pm",
 	19: "h:mm:ss am/pm",
-	20: "h:mm",
-	21: "h:mm:ss",
+	20: "hh:mm",
+	21: "hh:mm:ss",
 	22: "m/d/yy hh:mm",
 	37: "#,##0 ;(#,##0)",
 	38: "#,##0 ;[red](#,##0)",
@@ -1009,6 +1009,10 @@ func parseTime(v string, format string) string {
 	}
 	// It is the presence of the "am/pm" indicator that determines if this is
 	// a 12 hour or 24 hours time format, not the number of 'h' characters.
+	var padding bool
+	if val.Hour() == 0 && !strings.Contains(format, "hh") && !strings.Contains(format, "HH") {
+		padding = true
+	}
 	if is12HourTime(format) {
 		goFmt = strings.Replace(goFmt, "hh", "3", 1)
 		goFmt = strings.Replace(goFmt, "h", "3", 1)
@@ -1016,15 +1020,12 @@ func parseTime(v string, format string) string {
 		goFmt = strings.Replace(goFmt, "H", "3", 1)
 	} else {
 		goFmt = strings.Replace(goFmt, "hh", "15", 1)
-		if val.Hour() < 12 {
-			goFmt = strings.Replace(goFmt, "h", "3", 1)
-		} else {
-			goFmt = strings.Replace(goFmt, "h", "15", 1)
-		}
 		goFmt = strings.Replace(goFmt, "HH", "15", 1)
-		if val.Hour() < 12 {
+		if 0 < val.Hour() && val.Hour() < 12 {
+			goFmt = strings.Replace(goFmt, "h", "3", 1)
 			goFmt = strings.Replace(goFmt, "H", "3", 1)
 		} else {
+			goFmt = strings.Replace(goFmt, "h", "15", 1)
 			goFmt = strings.Replace(goFmt, "H", "15", 1)
 		}
 	}
@@ -1046,7 +1047,11 @@ func parseTime(v string, format string) string {
 		goFmt = strings.Replace(goFmt, "[3]", "3", 1)
 		goFmt = strings.Replace(goFmt, "[15]", "15", 1)
 	}
-	return val.Format(goFmt)
+	s := val.Format(goFmt)
+	if padding {
+		s = strings.Replace(s, "00:", "0:", 1)
+	}
+	return s
 }
 
 // is12HourTime checks whether an Excel time format string is a 12 hours form.
diff --git a/styles_test.go b/styles_test.go
index d3fde0c288..e2eed1d7f9 100644
--- a/styles_test.go
+++ b/styles_test.go
@@ -293,6 +293,14 @@ func TestParseTime(t *testing.T) {
 	assert.Equal(t, "2019-03-04 05:05:42", parseTime("43528.2123", "YYYY-MM-DD hh:mm:ss"))
 	assert.Equal(t, "2019-03-04 05:05:42", parseTime("43528.2123", "YYYY-MM-DD hh:mm:ss;YYYY-MM-DD hh:mm:ss"))
 	assert.Equal(t, "3/4/2019 5:5:42", parseTime("43528.2123", "M/D/YYYY h:m:s"))
+	assert.Equal(t, "3/4/2019 0:5:42", parseTime("43528.003958333335", "m/d/yyyy h:m:s"))
+	assert.Equal(t, "3/4/2019 0:05:42", parseTime("43528.003958333335", "M/D/YYYY h:mm:s"))
+	assert.Equal(t, "0:05", parseTime("43528.003958333335", "h:mm"))
+	assert.Equal(t, "0:0", parseTime("6.9444444444444444E-5", "h:m"))
+	assert.Equal(t, "0:00", parseTime("6.9444444444444444E-5", "h:mm"))
+	assert.Equal(t, "0:0", parseTime("6.9444444444444444E-5", "h:m"))
+	assert.Equal(t, "12:1", parseTime("0.50070601851851848", "h:m"))
+	assert.Equal(t, "23:30", parseTime("0.97952546296296295", "h:m"))
 	assert.Equal(t, "March", parseTime("43528", "mmmm"))
 	assert.Equal(t, "Monday", parseTime("43528", "dddd"))
 }