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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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""" |
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Date related utility functions. |
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""" |
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import datetime |
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import dateutil.tz |
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import dateutil.parser |
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__all__ = [ |
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'get_datetime_utc_now', |
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'add_utc_tz', |
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'convert_to_utc', |
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'parse' |
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] |
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def get_datetime_utc_now(): |
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""" |
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Retrieve datetime object for current time with included UTC timezone info. |
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:rtype: ``datetime.datetime`` |
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""" |
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dt = datetime.datetime.utcnow() |
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dt = add_utc_tz(dt) |
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return dt |
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def add_utc_tz(dt): |
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if dt.tzinfo and dt.tzinfo.utcoffset(dt) != datetime.timedelta(0): |
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raise ValueError('datetime already contains a non UTC timezone') |
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return dt.replace(tzinfo=dateutil.tz.tzutc()) |
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def convert_to_utc(dt): |
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""" |
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Convert provided datetime object to UTC timezone. |
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Note: If the object has no timezone information we assume it's in UTC. |
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:rtype: ``datetime.datetime`` |
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""" |
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if not dt.tzinfo: |
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return add_utc_tz(dt) |
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dt = dt.astimezone(dateutil.tz.tzutc()) |
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return dt |
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def parse(value, preserve_original_tz=False): |
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""" |
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Parse a date string and return a time-zone aware datetime object. |
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:param value: Date in ISO8601 format. |
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:type value: ``str`` |
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:param preserve_original_tz: True to preserve the original timezone - by default result is |
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converted into UTC. |
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:type preserve_original_tz: ``boolean`` |
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:rtype: ``datetime.datetime`` |
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""" |
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# pylint: disable=no-member |
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# For some reason pylint thinks it returns a tuple but it returns a datetime object |
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dt = dateutil.parser.parse(str(value)) |
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if not dt.tzinfo: |
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dt = add_utc_tz(dt) |
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if not preserve_original_tz: |
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dt = convert_to_utc(dt) |
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return dt |
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Plexxi /
st2
