126 lines
3.2 KiB
Python
126 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 Objectif Libre
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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# @author: Stéphane Albert
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#
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"""
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Time calculations functions
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We're mostly using oslo_utils for time calculations but we're encapsulating it
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to ease maintenance in case of library modifications.
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"""
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import calendar
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import datetime
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from oslo_utils import timeutils
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def dt2ts(orig_dt):
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"""Translate a datetime into a timestamp."""
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return calendar.timegm(orig_dt.timetuple())
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def iso2dt(iso_date):
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"""iso8601 format to datetime."""
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iso_dt = timeutils.parse_isotime(iso_date)
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trans_dt = timeutils.normalize_time(iso_dt)
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return trans_dt
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def ts2dt(timestamp):
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"""timestamp to datetime format."""
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if not isinstance(timestamp, float):
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timestamp = float(timestamp)
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return datetime.datetime.utcfromtimestamp(timestamp)
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def ts2iso(timestamp):
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"""timestamp to is8601 format."""
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if not isinstance(timestamp, float):
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timestamp = float(timestamp)
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return timeutils.iso8601_from_timestamp(timestamp)
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def dt2iso(orig_dt):
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"""datetime to is8601 format."""
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return timeutils.isotime(orig_dt)
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def utcnow():
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"""Returns a datetime for the current utc time."""
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return timeutils.utcnow()
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def utcnow_ts():
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"""Returns a timestamp for the current utc time."""
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return timeutils.utcnow_ts()
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def get_month_days(dt):
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return calendar.monthrange(dt.year, dt.month)[1]
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def add_days(base_dt, days, stay_on_month=True):
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if stay_on_month:
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max_days = get_month_days(base_dt)
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if days > max_days:
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return get_month_end(base_dt)
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return base_dt + datetime.timedelta(days=days)
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def add_month(dt, stay_on_month=True):
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next_month = get_next_month(dt)
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return add_days(next_month, dt.day, stay_on_month)
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def sub_month(dt, stay_on_month=True):
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prev_month = get_last_month(dt)
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return add_days(prev_month, dt.day, stay_on_month)
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def get_month_start(dt=None):
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if not dt:
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dt = utcnow()
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month_start = datetime.datetime(dt.year, dt.month, 1)
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return month_start
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def get_month_start_timestamp(dt=None):
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return dt2ts(get_month_start(dt))
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def get_month_end(dt=None):
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month_start = get_month_start(dt)
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days_of_month = get_month_days(month_start)
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month_end = month_start.replace(day=days_of_month)
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return month_end
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def get_last_month(dt=None):
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if not dt:
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dt = utcnow()
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month_end = get_month_start(dt) - datetime.timedelta(days=1)
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return get_month_start(month_end)
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def get_next_month(dt=None):
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month_end = get_month_end(dt)
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next_month = month_end + datetime.timedelta(days=1)
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return next_month
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def get_next_month_timestamp(dt=None):
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return dt2ts(get_next_month(dt))
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