1// Copyright 2014 Google LLC
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//      http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package datastore
16
17import (
18	"math"
19	"time"
20)
21
22var (
23	minTime = time.Unix(int64(math.MinInt64)/1e6, (int64(math.MinInt64)%1e6)*1e3)
24	maxTime = time.Unix(int64(math.MaxInt64)/1e6, (int64(math.MaxInt64)%1e6)*1e3)
25)
26
27func toUnixMicro(t time.Time) int64 {
28	// We cannot use t.UnixNano() / 1e3 because we want to handle times more than
29	// 2^63 nanoseconds (which is about 292 years) away from 1970, and those cannot
30	// be represented in the numerator of a single int64 divide.
31	return t.Unix()*1e6 + int64(t.Nanosecond()/1e3)
32}
33
34func fromUnixMicro(t int64) time.Time {
35	return time.Unix(t/1e6, (t%1e6)*1e3)
36}
37