--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext3rd/fastimport/vendor/python_fastimport/dates.py	Tue Jan 19 22:56:34 2021 +0000
@@ -0,0 +1,86 @@
+# Copyright (C) 2008 Canonical Ltd
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Date parsing routines.
+
+Each routine represents a date format that can be specified in a
+stream using the date-format feature.  The return value is
+timestamp,timezone where
+
+* timestamp is seconds since epoch
+* timezone is the offset from UTC in seconds.
+"""
+import time
+
+from fastimport import errors
+
+
+def parse_raw(s, lineno=0):
+    """Parse a date from a raw string.
+
+    The format must be exactly "seconds-since-epoch offset-utc".
+    See the spec for details.
+    """
+    timestamp_str, timezone_str = s.split(b' ', 1)
+    timestamp = float(timestamp_str)
+    try:
+        timezone = parse_tz(timezone_str)
+    except ValueError:
+        raise errors.InvalidTimezone(lineno, timezone_str)
+    return timestamp, timezone
+
+
+def parse_tz(tz):
+    """Parse a timezone specification in the [+|-]HHMM format.
+
+    :return: the timezone offset in seconds.
+    """
+    # from git_repository.py in bzr-git
+    sign_byte = tz[0:1]
+    # in python 3 b'+006'[0] would return an integer,
+    # but b'+006'[0:1] return a new bytes string.
+    if sign_byte not in (b'+', b'-'):
+        raise ValueError(tz)
+
+    sign = {b'+': +1, b'-': -1}[sign_byte]
+    hours = int(tz[1:-2])
+    minutes = int(tz[-2:])
+
+    return sign * 60 * (60 * hours + minutes)
+
+
+def parse_rfc2822(s, lineno=0):
+    """Parse a date from a rfc2822 string.
+
+    See the spec for details.
+    """
+    raise NotImplementedError(parse_rfc2822)
+
+
+def parse_now(s, lineno=0):
+    """Parse a date from a string.
+
+    The format must be exactly "now".
+    See the spec for details.
+    """
+    return time.time(), 0
+
+
+# Lookup tabel of date parsing routines
+DATE_PARSERS_BY_NAME = {
+    u'raw':      parse_raw,
+    u'rfc2822':  parse_rfc2822,
+    u'now':      parse_now,
+    }