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time_zone_util.go
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time_zone_util.go
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// Copyright 2017 The Cockroach Authors.
//
// 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 sqlbase
import (
"fmt"
"strconv"
"strings"
"time"
"github.com/cockroachdb/cockroach/pkg/util/timeutil"
)
const fixedOffsetPrefix string = "fixed offset:"
// FixedOffsetTimeZoneToLocation creates a time.Location with a set offset and
// with a name that can be marshalled by crdb between nodes.
func FixedOffsetTimeZoneToLocation(offset int, origRepr string) *time.Location {
return time.FixedZone(
fmt.Sprintf("%s%d (%s)", fixedOffsetPrefix, offset, origRepr),
offset)
}
// TimeZoneStringToLocation transforms a string into a time.Location. It
// supports the usual locations and also time zones with fixed offsets created
// by FixedOffsetTimeZoneToLocation().
func TimeZoneStringToLocation(location string) (*time.Location, error) {
offset, origRepr, parsed := ParseFixedOffsetTimeZone(location)
if parsed {
return FixedOffsetTimeZoneToLocation(offset, origRepr), nil
}
return timeutil.LoadLocation(location)
}
// ParseFixedOffsetTimeZone takes the string representation of a time.Location
// created by FixedOffsetTimeZoneToLocation and parses it to the offset and the
// original representation specified by the user. The bool returned is true if
// parsing was successful.
//
// The strings produced by FixedOffsetTimeZoneToLocation look like
// "<fixedOffsetPrefix><offset> (<origRepr>)".
func ParseFixedOffsetTimeZone(location string) (offset int, origRepr string, success bool) {
if !strings.HasPrefix(location, fixedOffsetPrefix) {
return 0, "", false
}
location = strings.TrimPrefix(location, fixedOffsetPrefix)
parts := strings.Split(location, " ")
if len(parts) < 2 {
return 0, "", false
}
offset, err := strconv.Atoi(parts[0])
if err != nil {
return 0, "", false
}
origRepr = parts[1]
if !strings.HasPrefix(origRepr, "(") || !strings.HasSuffix(origRepr, ")") {
return 0, "", false
}
return offset, strings.TrimSuffix(strings.TrimPrefix(origRepr, "("), ")"), true
}