1 files changed, 62 insertions, 0 deletions
diff --git a/src/pkg/time/zoneinfo_posix.go b/src/pkg/time/zoneinfo_posix.go
new file mode 100644
index 000000000..b49216410
--- /dev/null
+++ b/src/pkg/time/zoneinfo_posix.go
@@ -0,0 +1,62 @@
+// Copyright 2011 The Go 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 time
+
+import "sync"
+
+// Parsed representation
+type zone struct {
+	utcoff int
+	isdst  bool
+	name   string
+}
+
+type zonetime struct {
+	time         int32 // transition time, in seconds since 1970 GMT
+	zone         *zone // the zone that goes into effect at that time
+	isstd, isutc bool  // ignored - no idea what these mean
+}
+
+var zones []zonetime
+var onceSetupZone sync.Once
+
+// Look up the correct time zone (daylight savings or not) for the given unix time, in the current location.
+func lookupTimezone(sec int64) (zone string, offset int) {
+	onceSetupZone.Do(setupZone)
+	if len(zones) == 0 {
+		return "UTC", 0
+	}
+
+	// Binary search for entry with largest time <= sec
+	tz := zones
+	for len(tz) > 1 {
+		m := len(tz) / 2
+		if sec < int64(tz[m].time) {
+			tz = tz[0:m]
+		} else {
+			tz = tz[m:]
+		}
+	}
+	z := tz[0].zone
+	return z.name, z.utcoff
+}
+
+// lookupByName returns the time offset for the
+// time zone with the given abbreviation. It only considers
+// time zones that apply to the current system.
+// For example, for a system configured as being in New York,
+// it only recognizes "EST" and "EDT".
+// For a system in San Francisco, "PST" and "PDT".
+// For a system in Sydney, "EST" and "EDT", though they have
+// different meanings than they do in New York.
+func lookupByName(name string) (off int, found bool) {
+	onceSetupZone.Do(setupZone)
+	for _, z := range zones {
+		if name == z.zone.name {
+			return z.zone.utcoff, true
+		}
+	}
+	return 0, false
+}