Fix gps time calculation (#785)

* Change test case to match the date patterns where the bug reproduces * Fix RMC date and time calculation

Author: rhykw

gps/gpsparser.go

@@ -96,7 +96,10 @@ func (parser *Parser) Parse(sentence string) (Fix, error) {
 fix.Speed = findSpeed(fields[7])
 fix.Heading = findHeading(fields[8])
 date := findDate(fields[9])
-fix.Time = fix.Time.AddDate(date.Year(), int(date.Month()), date.Day())
+fix.Time = date.Add(time.Duration(fix.Time.Hour())*time.Hour +
+time.Duration(fix.Time.Minute())*time.Minute +
+time.Duration(fix.Time.Second())*time.Second +
+time.Duration(fix.Time.Nanosecond())*time.Nanosecond)
 
 return fix, nil
 }

gps/gpsparser_test.go

@@ -70,15 +70,15 @@ func TestParseRMC(t *testing.T) {
 t.Error("should have errInvalidRMCSentence error")
 }
 
-val = "$GPRMC,203522.00,A,5109.0262308,N,11401.8407342,W,0.004,133.4,130522,0.0,E,D*2B"
+val = "$GPRMC,203522.00,A,5109.0262308,N,11401.8407342,W,0.004,133.4,010622,0.0,E,D*2B"
 fix, err := p.Parse(val)
 if err != nil {
 t.Error("should have parsed")
 }
 
 c.Assert(fix.Time.Year(), qt.Equals, 2022)
-c.Assert(fix.Time.Month(), qt.Equals, time.May)
-c.Assert(fix.Time.Day(), qt.Equals, 13)
+c.Assert(fix.Time.Month(), qt.Equals, time.June)
+c.Assert(fix.Time.Day(), qt.Equals, 1)
 c.Assert(fix.Time.Hour(), qt.Equals, 20)
 c.Assert(fix.Time.Minute(), qt.Equals, 35)
 c.Assert(fix.Time.Second(), qt.Equals, 22)