39 lines
1.2 KiB
Go
39 lines
1.2 KiB
Go
// Package tz contains time zone info so that you can predictably load
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// Locations regardless of the locations available on the locally running
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// operating system.
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//
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// The stdlib time.LoadLocation function loads timezone data from the operating
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// system or from zoneinfo.zip in a local Go installation. Both of these are
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// often missing from some operating systems, especially Windows.
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//
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// This package has the zoneinfo.zip from Go embedded into the package so that
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// queries to load a location always return the same data regardless of
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// operating system.
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//
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// This package exists because of https://github.com/golang/go/issues/21881.
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package tz // import "4d63.com/tz"
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import (
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"errors"
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"time"
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)
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//go:generate rm -fr zoneinfo
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//go:generate unzip -q $GOROOT/lib/time/zoneinfo.zip -d zoneinfo/
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//go:generate go run 4d63.com/embedfiles -out=zoneinfo.go -pkg=tz zoneinfo/
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func tzData(name string) ([]byte, bool) {
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data, ok := files["zoneinfo/"+name]
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return data, ok
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}
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func LoadLocation(name string) (*time.Location, error) {
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if name == "" || name == "UTC" || name == "Local" {
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return time.LoadLocation(name)
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}
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if tzdata, ok := tzData(name); ok {
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return time.LoadLocationFromTZData(name, tzdata)
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}
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return nil, errors.New("unknown location " + name)
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}
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