From fddf519d2739c1e7a4d1be49393757405a1595ae Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Sun, 19 Jul 2015 14:26:10 +0200
Subject: removed week calculation


diff --git a/src/helsinki.at/rhrdtime/rhrdtime.go b/src/helsinki.at/rhrdtime/rhrdtime.go
index 519d465..5fa72a1 100644
--- a/src/helsinki.at/rhrdtime/rhrdtime.go
+++ b/src/helsinki.at/rhrdtime/rhrdtime.go
@@ -28,7 +28,6 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
-	"math"
 	"net/http"
 	"time"
 
@@ -36,35 +35,21 @@ import (
 	"github.com/gorilla/websocket"
 )
 
-func getRDWeekAndOffset(t time.Time) (uint8, int) {
-	//
-	// This computes the current Rivendell Week based on the number
-	// of weeks since epoch.
-	//
-	// Explanation:
-	//  epoch was at 01.01.1970 UTC which was a Thursday.
-	//  Monday in that week is (s-from-epoch + 3*24*60*60) seconds ago.
-	//  This needs to be adjusted by the timezone offset for Europe/Vienna
-	//  which is of course not constant (damn you daylight savings time)
-	//  Divide this by (7*24*60*60) and you get the number of
-	//  weeks since the Monday in the week of epoch adjusted for timezone offsets.
-	//  This week had week number 3 so add an offset of 2 and
-	//  get the modulo of 4. This rounded down gives you the current week
-	//  with 0 meaning Week 1. So add 1 to that number and you will get
-	//  the current RD week.
-	//
-
-	loc, err := time.LoadLocation("Europe/Vienna")
-	if err != nil {
+var (
+	loc *time.Location
+)
+
+func init() {
+	var err error
+	if loc, err = time.LoadLocation("Europe/Vienna"); err != nil {
 		fmt.Println("Error while loading loaction Europe/Vienna:", err)
-		return 0, 0
 	}
+}
 
+func getTZOffset(t time.Time) int {
 	t = t.In(loc)
 	_, offset := t.Zone()
-
-	sEpoch := t.Unix() + int64(offset)
-	return uint8(math.Floor(math.Mod((((float64(sEpoch)+259200)/604800)+2), 4)) + 1), offset
+	return offset
 }
 
 type ntpMessage struct {
@@ -73,7 +58,6 @@ type ntpMessage struct {
 	T3       int64 `json:"t3"`
 	T4       int64 `json:"t4"`
 	TZOffset int   `json:"tz_offset"`
-	Week     uint8 `json:"week"`
 }
 
 func handleNTPClient(w http.ResponseWriter, r *http.Request) {
@@ -103,7 +87,7 @@ func handleNTPClient(w http.ResponseWriter, r *http.Request) {
 			}
 
 			n.T2 = (now_t2.Unix() * 1000) + int64(now_t2.Nanosecond()/1000000)
-			n.Week, n.TZOffset = getRDWeekAndOffset(now_t2)
+			n.TZOffset = getTZOffset(now_t2)
 
 			now_t3 := time.Now()
 			n.T3 = (now_t3.Unix() * 1000) + int64(now_t3.Nanosecond()/1000000)
diff --git a/test/index.html b/test/index.html
index 42657a1..4b5b303 100644
--- a/test/index.html
+++ b/test/index.html
@@ -26,7 +26,7 @@
         }
 
         this.update = function() {
-          this.sock.send(JSON.stringify({ t1: (+new Date()), t2: 0, t3: 0, t4: 0, tz_offset: 0, week: 0 }));
+          this.sock.send(JSON.stringify({ t1: (+new Date()), t2: 0, t3: 0, t4: 0, tz_offset: 0 }));
         }
       }
 
-- 
cgit v0.10.2