forked from Elara6331/itd
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
package infinitime
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import (
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"bytes"
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"encoding/binary"
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"time"
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)
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// SetTime sets the current time, and then sets the timezone data,
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// if the local time characteristic is available.
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func (d *Device) SetTime(t time.Time) error {
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c, err := d.getChar(currentTimeChar)
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if err != nil {
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return err
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}
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buf := &bytes.Buffer{}
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binary.Write(buf, binary.LittleEndian, uint16(t.Year()))
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binary.Write(buf, binary.LittleEndian, uint8(t.Month()))
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binary.Write(buf, binary.LittleEndian, uint8(t.Day()))
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binary.Write(buf, binary.LittleEndian, uint8(t.Hour()))
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binary.Write(buf, binary.LittleEndian, uint8(t.Minute()))
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binary.Write(buf, binary.LittleEndian, uint8(t.Second()))
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binary.Write(buf, binary.LittleEndian, uint8(t.Weekday()))
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binary.Write(buf, binary.LittleEndian, uint8((t.Nanosecond()/1000)/1e6*256))
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binary.Write(buf, binary.LittleEndian, uint8(0b0001))
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_, err = c.WriteWithoutResponse(buf.Bytes())
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if err != nil {
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return err
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}
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ltc, err := d.getChar(localTimeChar)
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if err != nil {
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return nil
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}
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_, offset := t.Zone()
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dst := 0
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// Local time expects two values: the timezone offset and the dst offset, both
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// expressed in quarters of an hour.
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// Timezone offset is to be constant over DST, with dst offset holding the offset != 0
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// when DST is in effect.
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// As there is no standard way in go to get the actual dst offset, we assume it to be 1h
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// when DST is in effect
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if t.IsDST() {
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dst = 3600
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offset -= 3600
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}
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buf.Reset()
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binary.Write(buf, binary.LittleEndian, uint8(offset/3600*4))
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binary.Write(buf, binary.LittleEndian, uint8(dst/3600*4))
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_, err = ltc.WriteWithoutResponse(buf.Bytes())
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return err
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}
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