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57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
#
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# dates.py -- Date-related utilities.
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#
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# Copyright (c) 2008-2009 Christian Hammond
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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from datetime import datetime
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import time
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from django.db.models import DateField
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def http_date(timestamp):
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"""
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A wrapper around Django's http_date that accepts DateFields and
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datetime objects directly.
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"""
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from django.utils.http import http_date
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if isinstance(timestamp, (DateField, datetime)):
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return http_date(time.mktime(timestamp.timetuple()))
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elif isinstance(timestamp, basestring):
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return timestamp
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else:
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return http_date(timestamp)
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def get_latest_timestamp(timestamps):
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"""
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Returns the latest timestamp in a list of timestamps.
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"""
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latest = None
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for timestamp in timestamps:
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if latest is None or timestamp > latest:
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latest = timestamp
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return latest
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