This closes qax-os#1587, fix incorrect date time format result

Author: xuri

numfmt.go

@@ -1855,15 +1855,15 @@ func (nf *numberFormat) secondsHandler(token nfp.Token) {
 // for a number format expression.
 func (nf *numberFormat) elapsedDateTimesHandler(token nfp.Token) {
 	if strings.Contains(strings.ToUpper(token.TValue), "H") {
-		nf.result += fmt.Sprintf("%.f", nf.t.Sub(excel1900Epoc).Hours())
+		nf.result += fmt.Sprintf("%.f", math.Floor(nf.t.Sub(excel1900Epoc).Hours()))
 		return
 	}
 	if strings.Contains(strings.ToUpper(token.TValue), "M") {
-		nf.result += fmt.Sprintf("%.f", nf.t.Sub(excel1900Epoc).Minutes())
+		nf.result += fmt.Sprintf("%.f", math.Floor(nf.t.Sub(excel1900Epoc).Minutes()))
 		return
 	}
 	if strings.Contains(strings.ToUpper(token.TValue), "S") {
-		nf.result += fmt.Sprintf("%.f", nf.t.Sub(excel1900Epoc).Seconds())
+		nf.result += fmt.Sprintf("%.f", math.Floor(nf.t.Sub(excel1900Epoc).Seconds()))
 		return
 	}
 }

numfmt_test.go

@@ -48,6 +48,7 @@ func TestNumFmt(t *testing.T) {
 		{"43543.086539351854", "hh:mm:ss AM/PM", "02:04:37 AM"},
 		{"43543.086539351854", "AM/PM hh:mm:ss", "AM 02:04:37"},
 		{"43543.086539351854", "AM/PM hh:mm:ss a/p", "AM 02:04:37 a"},
+		{"0.609375", "[HH]:mm:ss", "14:37:30"},
 		{"43528", "YYYY", "2019"},
 		{"43528", "", "43528"},
 		{"43528.2123", "YYYY-MM-DD hh:mm:ss", "2019-03-04 05:05:43"},