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annotate libervia/backend/tools/common/date_utils.py @ 4108:238e305f2306

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author Goffi <goffi@goffi.org>
date Thu, 06 Jul 2023 11:34:51 +0200
parents 4325a0f13b0f
children c6d85c31a59f
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """tools to help manipulating time and dates"""
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21
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22 from typing import Union
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23 import calendar
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24 import datetime
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25 import re
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26 import time
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27
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28 from babel import dates
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29 from dateutil import parser, tz
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30 from dateutil.parser import ParserError
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31 from dateutil.relativedelta import relativedelta
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32 from dateutil.utils import default_tzinfo
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33
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34 from libervia.backend.core import exceptions
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35 from libervia.backend.core.constants import Const as C
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36 from libervia.backend.core.i18n import _
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37
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38 RELATIVE_RE = re.compile(
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39 r"\s*(?P<in>\bin\b)?"
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40 r"(?P<date>[^+-][^+]+[^\s+-])?\s*(?P<direction>[-+])?\s*"
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41 r"\s*(?P<quantity>\d+)\s*"
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42 r"(?P<unit>(second|sec|s|minute|min|month|mo|m|hour|hr|h|day|d|week|w|year|yr|y))s?"
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43 r"(?P<ago>\s+ago)?\s*",
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44 re.I
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45 )
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46 TIME_SYMBOL_MAP = {
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47 "s": "second",
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48 "sec": "second",
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49 "m": "minute",
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50 "min": "minute",
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51 "h": "hour",
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52 "hr": "hour",
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53 "d": "day",
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54 "w": "week",
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55 "mo": "month",
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56 "y": "year",
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57 "yr": "year",
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58 }
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59 YEAR_FIRST_RE = re.compile(r"\d{4}[^\d]+")
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60 TZ_UTC = tz.tzutc()
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61 TZ_LOCAL = tz.gettz()
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63
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64 def date_parse(value, default_tz=TZ_UTC):
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65 """Parse a date and return corresponding unix timestamp
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66
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67 @param value(unicode): date to parse, in any format supported by parser
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68 @param default_tz(datetime.tzinfo): default timezone
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69 @return (int): timestamp
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70 """
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71 value = str(value).strip()
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72 dayfirst = False if YEAR_FIRST_RE.match(value) else True
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73
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74 try:
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75 dt = default_tzinfo(
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76 parser.parse(value, dayfirst=dayfirst),
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77 default_tz)
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78 except ParserError as e:
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79 if value == "now":
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80 dt = datetime.datetime.now(tz.tzutc())
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81 else:
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82 try:
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83 # the date may already be a timestamp
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84 return int(value)
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85 except ValueError:
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86 raise e
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87 return calendar.timegm(dt.utctimetuple())
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88
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89 def date_parse_ext(value, default_tz=TZ_UTC):
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90 """Extended date parse which accept relative date
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91
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92 @param value(unicode): date to parse, in any format supported by parser
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93 and with the hability to specify X days/weeks/months/years in the past or future.
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94 Relative date are specified either with something like `[main_date] +1 week`
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95 or with something like `3 days ago`, and it is case insensitive. [main_date] is
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96 a date parsable by parser, or empty to specify current date/time.
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97 "now" can also be used to specify current date/time.
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98 @param default_tz(datetime.tzinfo): same as for date_parse
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99 @return (int): timestamp
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100 """
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101 m = RELATIVE_RE.match(value)
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102 if m is None:
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103 return date_parse(value, default_tz=default_tz)
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104
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105 if sum(1 for g in ("direction", "in", "ago") if m.group(g)) > 1:
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106 raise ValueError(
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107 _('You can use only one of direction (+ or -), "in" and "ago"'))
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108
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109 if m.group("direction") == '-' or m.group("ago"):
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110 direction = -1
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111 else:
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112 direction = 1
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113
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114 date = m.group("date")
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115 if date is not None:
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116 date = date.strip()
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117 if not date or date == "now":
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118 dt = datetime.datetime.now(tz.tzutc())
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119 else:
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120 try:
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121 dt = default_tzinfo(parser.parse(date, dayfirst=True), default_tz)
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122 except ParserError as e:
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123 try:
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124 timestamp = int(date)
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125 except ValueError:
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126 raise e
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127 else:
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128 dt = datetime.datetime.fromtimestamp(timestamp, tz.tzutc())
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129
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130 quantity = int(m.group("quantity"))
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131 unit = m.group("unit").lower()
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132 try:
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133 unit = TIME_SYMBOL_MAP[unit]
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134 except KeyError:
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135 pass
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136 delta_kw = {f"{unit}s": direction * quantity}
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137 dt = dt + relativedelta(**delta_kw)
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138 return calendar.timegm(dt.utctimetuple())
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139
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140
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141 def date_fmt(
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142 timestamp: Union[float, int, str],
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143 fmt: str = "short",
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144 date_only: bool = False,
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145 auto_limit: int = 7,
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146 auto_old_fmt: str = "short",
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147 auto_new_fmt: str = "relative",
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148 locale_str: str = C.DEFAULT_LOCALE,
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149 tz_info: Union[datetime.tzinfo, str] = TZ_UTC
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150 ) -> str:
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151 """Format date according to locale
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152
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153 @param timestamp: unix time
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154 @param fmt: one of:
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155 - short: e.g. u'31/12/17'
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156 - medium: e.g. u'Apr 1, 2007'
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157 - long: e.g. u'April 1, 2007'
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158 - full: e.g. u'Sunday, April 1, 2007'
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159 - relative: format in relative time
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160 e.g.: 3 hours
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161 note that this format is not precise
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162 - iso: ISO 8601 format
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163 e.g.: u'2007-04-01T19:53:23Z'
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164 - auto: use auto_old_fmt if date is older than auto_limit
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165 else use auto_new_fmt
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166 - auto_day: shorcut to set auto format with change on day
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167 old format will be short, and new format will be time only
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168 or a free value which is passed to babel.dates.format_datetime
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169 (see http://babel.pocoo.org/en/latest/dates.html?highlight=pattern#pattern-syntax)
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170 @param date_only: if True, only display date (not datetime)
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171 @param auto_limit: limit in days before using auto_old_fmt
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172 use 0 to have a limit at last midnight (day change)
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173 @param auto_old_fmt: format to use when date is older than limit
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174 @param auto_new_fmt: format to use when date is equal to or more recent
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175 than limit
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176 @param locale_str: locale to use (as understood by babel)
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177 @param tz_info: time zone to use
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178
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179 """
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180 timestamp = float(timestamp)
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181 if isinstance(tz_info, str):
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182 tz_info = tz.gettz(tz_info)
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183 if fmt == "auto_day":
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184 fmt, auto_limit, auto_old_fmt, auto_new_fmt = "auto", 0, "short", "HH:mm"
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185 if fmt == "auto":
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186 if auto_limit == 0:
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187 now = datetime.datetime.now(tz_info)
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188 # we want to use given tz_info, so we don't use date() or today()
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189 today = datetime.datetime(year=now.year, month=now.month, day=now.day,
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190 tzinfo=now.tzinfo)
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191 today = calendar.timegm(today.utctimetuple())
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192 if timestamp < today:
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193 fmt = auto_old_fmt
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194 else:
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195 fmt = auto_new_fmt
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196 else:
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197 days_delta = (time.time() - timestamp) / 3600
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198 if days_delta > (auto_limit or 7):
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199 fmt = auto_old_fmt
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200 else:
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201 fmt = auto_new_fmt
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202
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203 if fmt == "relative":
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204 delta = timestamp - time.time()
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205 return dates.format_timedelta(
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206 delta, granularity="minute", add_direction=True, locale=locale_str
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207 )
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208 elif fmt in ("short", "long", "full"):
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209 if date_only:
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210 dt = datetime.datetime.fromtimestamp(timestamp, tz_info)
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211 return dates.format_date(dt, format=fmt, locale=locale_str)
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212 else:
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213 return dates.format_datetime(timestamp, format=fmt, locale=locale_str,
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214 tzinfo=tz_info)
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215 elif fmt == "iso":
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216 if date_only:
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217 fmt = "yyyy-MM-dd"
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218 else:
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219 fmt = "yyyy-MM-ddTHH:mm:ss'Z'"
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220 return dates.format_datetime(timestamp, format=fmt)
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221 else:
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222 return dates.format_datetime(timestamp, format=fmt, locale=locale_str,
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223 tzinfo=tz_info)
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224
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225
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226 def delta2human(start_ts: Union[float, int], end_ts: Union[float, int]) -> str:
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227 """Convert delta of 2 unix times to human readable text
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228
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229 @param start_ts: timestamp of starting time
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230 @param end_ts: timestamp of ending time
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231 """
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232 if end_ts < start_ts:
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233 raise exceptions.InternalError(
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234 "end timestamp must be bigger or equal to start timestamp !"
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235 )
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236 rd = relativedelta(
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237 datetime.datetime.fromtimestamp(end_ts),
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238 datetime.datetime.fromtimestamp(start_ts)
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239 )
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240 text_elems = []
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241 for unit in ("years", "months", "days", "hours", "minutes"):
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242 value = getattr(rd, unit)
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243 if value == 1:
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244 # we remove final "s" when there is only 1
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245 text_elems.append(f"1 {unit[:-1]}")
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246 elif value > 1:
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247 text_elems.append(f"{value} {unit}")
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248
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249 return ", ".join(text_elems)
4029
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250
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251
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252 def get_timezone_name(tzinfo, timestamp: Union[float, int]) -> str:
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253 """
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254 Get the DST-aware timezone name for a given timezone and timestamp.
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255
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256 @param tzinfo: The timezone to get the name for
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257 @param timestamp: The timestamp to use, as a Unix timestamp (number of seconds since
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258 the Unix epoch).
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259 @return: The DST-aware timezone name.
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260 """
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261
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262 dt = datetime.datetime.fromtimestamp(timestamp)
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263 dt_tz = dt.replace(tzinfo=tzinfo)
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264 tz_name = dt_tz.tzname()
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265 if tz_name is None:
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266 raise exceptions.InternalError("tz_name should not be None")
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267 return tz_name