--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/isodate/isotzinfo.py	Sat May 02 07:14:21 2020 -0400
@@ -0,0 +1,112 @@
+##############################################################################
+# Copyright 2009, Gerhard Weis
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#  * Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright notice,
+#    this list of conditions and the following disclaimer in the documentation
+#    and/or other materials provided with the distribution.
+#  * Neither the name of the authors nor the names of its contributors
+#    may be used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT
+##############################################################################
+'''
+This module provides an ISO 8601:2004 time zone info parser.
+
+It offers a function to parse the time zone offset as specified by ISO 8601.
+'''
+import re
+
+from isodate.isoerror import ISO8601Error
+from isodate.tzinfo import UTC, FixedOffset, ZERO
+
+TZ_REGEX = r"(?P<tzname>(Z|(?P<tzsign>[+-])"\
+           r"(?P<tzhour>[0-9]{2})(:?(?P<tzmin>[0-9]{2}))?)?)"
+
+TZ_RE = re.compile(TZ_REGEX)
+
+
+def build_tzinfo(tzname, tzsign='+', tzhour=0, tzmin=0):
+    '''
+    create a tzinfo instance according to given parameters.
+
+    tzname:
+      'Z'       ... return UTC
+      '' | None ... return None
+      other     ... return FixedOffset
+    '''
+    if tzname is None or tzname == '':
+        return None
+    if tzname == 'Z':
+        return UTC
+    tzsign = ((tzsign == '-') and -1) or 1
+    return FixedOffset(tzsign * tzhour, tzsign * tzmin, tzname)
+
+
+def parse_tzinfo(tzstring):
+    '''
+    Parses ISO 8601 time zone designators to tzinfo objecs.
+
+    A time zone designator can be in the following format:
+              no designator indicates local time zone
+      Z       UTC
+      +-hhmm  basic hours and minutes
+      +-hh:mm extended hours and minutes
+      +-hh    hours
+    '''
+    match = TZ_RE.match(tzstring)
+    if match:
+        groups = match.groupdict()
+        return build_tzinfo(groups['tzname'], groups['tzsign'],
+                            int(groups['tzhour'] or 0),
+                            int(groups['tzmin'] or 0))
+    raise ISO8601Error('%s not a valid time zone info' % tzstring)
+
+
+def tz_isoformat(dt, format='%Z'):
+    '''
+    return time zone offset ISO 8601 formatted.
+    The various ISO formats can be chosen with the format parameter.
+
+    if tzinfo is None returns ''
+    if tzinfo is UTC returns 'Z'
+    else the offset is rendered to the given format.
+    format:
+        %h ... +-HH
+        %z ... +-HHMM
+        %Z ... +-HH:MM
+    '''
+    tzinfo = dt.tzinfo
+    if (tzinfo is None) or (tzinfo.utcoffset(dt) is None):
+        return ''
+    if tzinfo.utcoffset(dt) == ZERO and tzinfo.dst(dt) == ZERO:
+        return 'Z'
+    tdelta = tzinfo.utcoffset(dt)
+    seconds = tdelta.days * 24 * 60 * 60 + tdelta.seconds
+    sign = ((seconds < 0) and '-') or '+'
+    seconds = abs(seconds)
+    minutes, seconds = divmod(seconds, 60)
+    hours, minutes = divmod(minutes, 60)
+    if hours > 99:
+        raise OverflowError('can not handle differences > 99 hours')
+    if format == '%Z':
+        return '%s%02d:%02d' % (sign, hours, minutes)
+    elif format == '%z':
+        return '%s%02d%02d' % (sign, hours, minutes)
+    elif format == '%h':
+        return '%s%02d' % (sign, hours)
+    raise ValueError('unknown format string "%s"' % format)