time.go

// Copyright 2020 SEQSENSE, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package kinesisvideomanager

import (
	"fmt"
	"strconv"
	"strings"
	"time"
)

func ToTimestamp(t time.Time) string {
	unix := fmt.Sprintf("%d", t.Unix())
	if millis := t.Nanosecond() / int(time.Millisecond); millis > 0 {
		return fmt.Sprintf("%s.%03d", unix, millis)
	}
	return unix
}

func ParseTimestamp(timestamp string) (time.Time, error) {
	secNano := strings.Split(timestamp, ".")
	if len(secNano) != 1 && len(secNano) != 2 {
		return time.Time{}, fmt.Errorf("failed to parse timestamp: %s", timestamp)
	}
	seconds, err := strconv.ParseInt(secNano[0], 10, 64)
	if err != nil {
		return time.Time{}, err
	}
	if len(secNano) == 1 {
		return time.Unix(seconds, 0), nil
	}
	nanoSec, err := strconv.ParseInt((secNano[1] + "000000000")[:9], 10, 64)
	if err != nil {
		return time.Time{}, err
	}
	return time.Unix(seconds, nanoSec), nil
}