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50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
import datetime as dt
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import time
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class Datetime:
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"""Helps to pack and unpack datetime objects for the Broadlink protocol."""
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@staticmethod
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def pack(datetime: dt.datetime) -> bytes:
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"""Pack the timestamp to be sent over the Broadlink protocol."""
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data = bytearray(12)
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utcoffset = int(datetime.utcoffset().total_seconds() / 3600)
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data[:0x04] = utcoffset.to_bytes(4, "little", signed=True)
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data[0x04:0x06] = datetime.year.to_bytes(2, "little")
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data[0x06] = datetime.minute
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data[0x07] = datetime.hour
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data[0x08] = int(datetime.strftime('%y'))
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data[0x09] = datetime.isoweekday()
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data[0x0A] = datetime.day
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data[0x0B] = datetime.month
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return data
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@staticmethod
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def unpack(data: bytes) -> dt.datetime:
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"""Unpack a timestamp received over the Broadlink protocol."""
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utcoffset = int.from_bytes(data[0x00:0x04], "little", signed=True)
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year = int.from_bytes(data[0x04:0x06], "little")
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minute = data[0x06]
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hour = data[0x07]
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subyear = data[0x08]
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isoweekday = data[0x09]
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day = data[0x0A]
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month = data[0x0B]
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tz_info = dt.timezone(dt.timedelta(hours=utcoffset))
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datetime = dt.datetime(year, month, day, hour, minute, 0, 0, tz_info)
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if datetime.isoweekday() != isoweekday:
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raise ValueError("isoweekday does not match")
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if int(datetime.strftime('%y')) != subyear:
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raise ValueError("subyear does not match")
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return datetime
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@staticmethod
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def now() -> dt.datetime:
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"""Return the current date and time with timezone info."""
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tz_info = dt.timezone(dt.timedelta(seconds=-time.timezone))
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return dt.datetime.now(tz_info)
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