git.r.bdr.sh - rbdr/mobius/blob - hotline/time.go

   1 package hotline
   2
   3 import (
   4         "encoding/binary"
   5         "slices"
   6         "time"
   7 )
   8
   9 // toHotlineTime converts a time.Time to the 8 byte Hotline time format:
  10 // Year (2 bytes), milliseconds (2 bytes) and seconds (4 bytes)
  11 func toHotlineTime(t time.Time) (b [8]byte) {
  12         yearBytes := make([]byte, 2)
  13         secondBytes := make([]byte, 4)
  14
  15         // Get a time.Time for January 1st 00:00 from t so we can calculate the difference in seconds from t
  16         startOfYear := time.Date(t.Year(), time.January, 1, 0, 0, 0, 0, time.Local)
  17
  18         binary.BigEndian.PutUint16(yearBytes, uint16(t.Year()))
  19         binary.BigEndian.PutUint32(secondBytes, uint32(t.Sub(startOfYear).Seconds()))
  20
  21         return [8]byte(slices.Concat(
  22                 yearBytes,
  23                 []byte{0, 0},
  24                 secondBytes,
  25         ))
  26 }