Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/dateutil/utils.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 (2021-03-22) |
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1 # -*- coding: utf-8 -*- |
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2 """ |
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3 This module offers general convenience and utility functions for dealing with |
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4 datetimes. |
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5 |
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6 .. versionadded:: 2.7.0 |
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7 """ |
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8 from __future__ import unicode_literals |
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9 |
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10 from datetime import datetime, time |
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11 |
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12 |
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13 def today(tzinfo=None): |
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14 """ |
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15 Returns a :py:class:`datetime` representing the current day at midnight |
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16 |
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17 :param tzinfo: |
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18 The time zone to attach (also used to determine the current day). |
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19 |
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20 :return: |
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21 A :py:class:`datetime.datetime` object representing the current day |
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22 at midnight. |
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23 """ |
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24 |
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25 dt = datetime.now(tzinfo) |
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26 return datetime.combine(dt.date(), time(0, tzinfo=tzinfo)) |
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27 |
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28 |
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29 def default_tzinfo(dt, tzinfo): |
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30 """ |
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31 Sets the ``tzinfo`` parameter on naive datetimes only |
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32 |
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33 This is useful for example when you are provided a datetime that may have |
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34 either an implicit or explicit time zone, such as when parsing a time zone |
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35 string. |
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36 |
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37 .. doctest:: |
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38 |
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39 >>> from dateutil.tz import tzoffset |
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40 >>> from dateutil.parser import parse |
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41 >>> from dateutil.utils import default_tzinfo |
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42 >>> dflt_tz = tzoffset("EST", -18000) |
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43 >>> print(default_tzinfo(parse('2014-01-01 12:30 UTC'), dflt_tz)) |
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44 2014-01-01 12:30:00+00:00 |
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45 >>> print(default_tzinfo(parse('2014-01-01 12:30'), dflt_tz)) |
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46 2014-01-01 12:30:00-05:00 |
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47 |
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48 :param dt: |
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49 The datetime on which to replace the time zone |
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50 |
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51 :param tzinfo: |
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52 The :py:class:`datetime.tzinfo` subclass instance to assign to |
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53 ``dt`` if (and only if) it is naive. |
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54 |
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55 :return: |
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56 Returns an aware :py:class:`datetime.datetime`. |
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57 """ |
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58 if dt.tzinfo is not None: |
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59 return dt |
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60 else: |
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61 return dt.replace(tzinfo=tzinfo) |
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62 |
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63 |
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64 def within_delta(dt1, dt2, delta): |
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65 """ |
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66 Useful for comparing two datetimes that may a negilible difference |
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67 to be considered equal. |
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68 """ |
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69 delta = abs(delta) |
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70 difference = dt1 - dt2 |
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71 return -delta <= difference <= delta |