Store CreationTime from header when reading Palm database

Arguably, this is a crutch because the current in-memory PalmDB
representation only stores one date and writes that to multiple
non-equivalent header fields and records.  Still, this should be
better than just ignoring the stored dates.

pdb/headers.go

@@ -24,7 +24,7 @@ type PalmDBHeader struct {
 func NewPalmDBHeader(name string, dateTime time.Time, numRecords uint16, lastRecordUID uint32) PalmDBHeader {
 	nameBytes := [32]byte{}
 	copy(nameBytes[:31], name)
-	palmTime := calculatePalmTime(dateTime)
+	palmTime := convertToPalmTime(dateTime)
 
 	return PalmDBHeader{
 		Name:               nameBytes,

pdb/pdb.go

@@ -121,6 +121,9 @@ func ReadDatabase(r io.Reader) (*Database, error) {
 		return nil, err
 	}
 
+	name := trimZeroes(string(palmDBHeader.Name[:]))
+	date := convertFromPalmTime(palmDBHeader.CreationTime)
+
 	records := make([]Record, 0)
 	for i := 1; i < len(offsets); i++ {
 		curr := offsets[i].Offset
@@ -130,10 +133,9 @@ func ReadDatabase(r io.Reader) (*Database, error) {
 	last := offsets[len(offsets)-1].Offset
 	records = append(records, RawRecord(data[last:]))
 
-	name := trimZeroes(string(palmDBHeader.Name[:]))
-
 	return &Database{
 		Name:    name,
+		Date:    date,
 		Records: records,
 	}, nil
 }

pdb/util.go

@@ -9,7 +9,12 @@ func trimZeroes(s string) string {
 	return strings.TrimRight(s, "\x00")
 }
 
-func calculatePalmTime(t time.Time) uint32 {
+func convertToPalmTime(t time.Time) uint32 {
 	delta := t.Sub(time.Date(1904, 1, 1, 0, 0, 0, 0, time.UTC))
 	return uint32(delta.Seconds())
 }
+
+func convertFromPalmTime(t uint32) time.Time {
+	start := time.Date(1904, 1, 1, 0, 0, 0, 0, time.UTC)
+	return start.Add(time.Duration(t) * time.Second)
+}