Python datetime 模块，tzinfo() 实例源码

我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用datetime.tzinfo()。

项目：CodingDojo 作者：ComputerSocietyUNB | 项目源码 | 文件源码

def timezone_tag(parser, token):
    """
    Enables a given time zone just for this block.

    The ``timezone`` argument must be an instance of a ``tzinfo`` subclass, a
    time zone name, or ``None``. If is it a time zone name, pytz is required.
    If it is ``None``, the default time zone is used within the block.

    Sample usage::

        {% timezone "Europe/Paris" %}
            It is {{ now }} in Paris.
        {% endtimezone %}
    """
    bits = token.split_contents()
    if len(bits) != 2:
        raise TemplateSyntaxError("'%s' takes one argument (timezone)" %
                                  bits[0])
    tz = parser.compile_filter(bits[1])
    nodelist = parser.parse(('endtimezone',))
    parser.delete_first_token()
    return TimezoneNode(nodelist, tz)

项目：zipline-chinese 作者：zhanghan1990 | 项目源码 | 文件源码

def ensure_timezone(func, argname, arg):
    """Argument preprocessor that converts the input into a tzinfo object.

    Usage
    -----
    >>> from zipline.utils.preprocess import preprocess
    >>> @preprocess(tz=ensure_timezone)
    ... def foo(tz):
    ...     return tz
    >>> foo('utc')
    <UTC>
    """
    if isinstance(arg, tzinfo):
        return arg
    if isinstance(arg, string_types):
        return timezone(arg)

    raise TypeError(
        "{func}() couldn't convert argument "
        "{argname}={arg!r} to a timezone.".format(
            func=_qualified_name(func),
            argname=argname,
            arg=arg,
        ),
    )

项目：sndlatr 作者：Schibum | 项目源码 | 文件源码

def dst(self, dt):
        if dt is None or dt.tzinfo is None:
            # An exception may be sensible here, in one or both cases.
            # It depends on how you want to treat them.  The default
            # fromutc() implementation (called by the default astimezone()
            # implementation) passes a datetime with dt.tzinfo is self.
            return ZERO
        assert dt.tzinfo is self

        # Find first Sunday in April & the last in October.
        start = first_sunday_on_or_after(DSTSTART.replace(year=dt.year))
        end = first_sunday_on_or_after(DSTEND.replace(year=dt.year))

        # Can't compare naive to aware objects, so strip the timezone from
        # dt first.
        if start <= dt.replace(tzinfo=None) < end:
            return HOUR
        else:
            return ZERO

项目：sndlatr 作者：Schibum | 项目源码 | 文件源码

def parse_timezone(tzstring, default_timezone=UTC):
    """Parses ISO 8601 time zone specs into tzinfo offsets

    """
    if tzstring == "Z":
        return default_timezone
    # This isn't strictly correct, but it's common to encounter dates without
    # timezones so I'll assume the default (which defaults to UTC).
    # Addresses issue 4.
    if tzstring is None:
        return default_timezone
    m = TIMEZONE_REGEX.match(tzstring)
    prefix, hours, minutes = m.groups()
    hours, minutes = int(hours), int(minutes)
    if prefix == "-":
        hours = -hours
        minutes = -minutes
    return FixedOffset(hours, minutes, tzstring)

项目：purelove 作者：hucmosin | 项目源码 | 文件源码

def local(class_):
        """Returns the local time zone as defined by the operating system in the
        registry.
        >>> localTZ = TimeZoneInfo.local()
        >>> now_local = datetime.datetime.now(localTZ)
        >>> now_UTC = datetime.datetime.utcnow()
        >>> (now_UTC - now_local) < datetime.timedelta(seconds = 5)
        Traceback (most recent call last):
        ...
        TypeError: can't subtract offset-naive and offset-aware datetimes

        >>> now_UTC = now_UTC.replace(tzinfo = TimeZoneInfo('GMT Standard Time', True))

        Now one can compare the results of the two offset aware values
        >>> (now_UTC - now_local) < datetime.timedelta(seconds = 5)
        True
        """
        code, info = TimeZoneDefinition.current()
        # code is 0 if daylight savings is disabled or not defined
        #  code is 1 or 2 if daylight savings is enabled, 2 if currently active
        fix_standard_time = not code
        # note that although the given information is sufficient to construct a WinTZI object, it's
        #  not sufficient to represent the time zone in which the current user is operating due
        #  to dynamic time zones.
        return class_(info, fix_standard_time)

项目：Texty 作者：sarthfrey | 项目源码 | 文件源码

def dst(self, dt):
        if dt is None or dt.tzinfo is None:
            # An exception may be sensible here, in one or both cases.
            # It depends on how you want to treat them.  The default
            # fromutc() implementation (called by the default astimezone()
            # implementation) passes a datetime with dt.tzinfo is self.
            return ZERO
        assert dt.tzinfo is self

        # Find first Sunday in April & the last in October.
        start = first_sunday_on_or_after(DSTSTART.replace(year=dt.year))
        end = first_sunday_on_or_after(DSTEND.replace(year=dt.year))

        # Can't compare naive to aware objects, so strip the timezone from
        # dt first.
        if start <= dt.replace(tzinfo=None) < end:
            return HOUR
        else:
            return ZERO