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 type Time [8]byte
  10
  11 // NewTime converts a time.Time to the 8 byte Hotline time format:
  12 // Year (2 bytes), milliseconds (2 bytes) and seconds (4 bytes)
  13 func NewTime(t time.Time) (b Time) {
  14         yearBytes := make([]byte, 2)
  15         secondBytes := make([]byte, 4)
  16
  17         // Get a time.Time for January 1st 00:00 from t so we can calculate the difference in seconds from t
  18         startOfYear := time.Date(t.Year(), time.January, 1, 0, 0, 0, 0, time.Local)
  19
  20         binary.BigEndian.PutUint16(yearBytes, uint16(t.Year()))
  21         binary.BigEndian.PutUint32(secondBytes, uint32(t.Sub(startOfYear).Seconds()))
  22
  23         return [8]byte(slices.Concat(
  24                 yearBytes,
  25                 []byte{0, 0},
  26                 secondBytes,
  27         ))
  28 }