Use int64 to store time.Time internally in memory implementation.

service/datastore/serialize/serialize_test.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package serialize
 
 import (
         "bytes"
         "fmt"
         "io"
@@ skipping 156 matching lines @@
                         cmpbin.WriteString(buf, "nerp")
                         So(string(ToBytes(mp("nerp"))),
                                 ShouldEqual, buf.String())
                 })
 
                 Convey("Time", func() {
                         tp := mp(time.Now().UTC())
                         So(string(ToBytes(tp.Value())), ShouldEqual, string(ToBytes(tp)[1:]))
                 })
 
+                Convey("Zero time", func() {
+                        buf := mkBuf(nil)
+                        So(WriteTime(buf, time.Time{}), ShouldBeNil)
+                        t, err := ReadTime(mkBuf(buf.Bytes()))
+                        So(err, ShouldBeNil)
+                        So(t.IsZero(), ShouldBeTrue)
+                })
+
                 Convey("Bad ToBytes", func() {
                         So(func() { ToBytes(100.7) }, ShouldPanic)
                         So(func() { ToBytesWithContext(100.7) }, ShouldPanic)
                 })
 
                 Convey("ReadKey", func() {
                         Convey("good cases", func() {
                                 Convey("w/ ctx decodes normally w/ ctx", func() {
                                         k := mkKey("aid", "ns", "knd", "yo", "other", 10)
                                         data := ToBytesWithContext(k)
@@ skipping 258 matching lines @@
                                 for i := 0; i < MaxIndexColumns+1; i++ {
                                         id.SortBy = append(id.SortBy, ds.IndexColumn{Property: "Hi", Direction: ds.ASCENDING})
                                 }
                                 data := ToBytes(*id.PrepForIdxTable())
                                 newID, err = ReadIndexDefinition(mkBuf(data))
                                 So(err, ShouldErrLike, "over 64 sort orders")
                         })
                 })
         })
 }