Function _parse_tz_delta

Lib/zoneinfo/_zoneinfo.py:753–776

(tz_delta)

def _parse_tz_delta(tz_delta):
    match = re.fullmatch(
        r"(?P<sign>[+-])?(?P<h>\d{1,3})(:(?P<m>\d{2})(:(?P<s>\d{2}))?)?",
        tz_delta,
        re.ASCII
    )
    # Anything passed to this function should already have hit an equivalent
    # regular expression to find the section to parse.
    assert match is not None, tz_delta

    h, m, s = (int(v or 0) for v in match.group("h", "m", "s"))

    total = h * 3600 + m * 60 + s

    if h > 24:
        raise ValueError(
            f"Offset hours must be in [0, 24]: {tz_delta}"
        )

    # Yes, +5 maps to an offset of -5h
    if match.group("sign") != "-":
        total = -total

    return total