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-rw-r--r--src/helsinki.at/rhrdtime/rhrdtime.go33
1 files changed, 31 insertions, 2 deletions
diff --git a/src/helsinki.at/rhrdtime/rhrdtime.go b/src/helsinki.at/rhrdtime/rhrdtime.go
index 5a9f0d0..a5b47f5 100644
--- a/src/helsinki.at/rhrdtime/rhrdtime.go
+++ b/src/helsinki.at/rhrdtime/rhrdtime.go
@@ -27,6 +27,7 @@ package main
import (
"fmt"
"time"
+ "math"
"flag"
"net/http"
"encoding/json"
@@ -38,13 +39,41 @@ import (
type timeUpdate struct {
Timestamp int64 `json:"timestamp"`
+ TZOffset int `json:"tz-offset"`
Week uint8 `json:"week"`
}
func getTimeUpdate() []byte {
- now := time.Now()
+ //
+ // 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 {
+ fmt.Println(err)
+ return []byte{'{', '}'}
+ }
+
+ now := time.Now().In(loc);
+ _, offset := now.Zone()
+
+ sEpoch := now.Unix() + int64(offset)
+ week := uint8(math.Floor(math.Mod((((float64(sEpoch) + 259200)/604800) + 2), 4)) + 1)
- update := timeUpdate{now.Unix(), 1}
+ update := timeUpdate{now.Unix(), offset, week}
update_json, err := json.Marshal(update)
if err != nil {
fmt.Println(err)