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diff --git a/nikola/packages/datecond/__init__.py b/nikola/packages/datecond/__init__.py
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+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+# Date Conditionals v0.1.7
+# Copyright © 2015-2020, Chris Warrick.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions, and the following disclaimer.
+#
+# 2. 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.
+#
+# 3. Neither the name of the author of this software nor the names of
+#    contributors to this software may be used to endorse or promote
+#    products derived from this software without specific prior written
+#    consent.
+#
+# 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
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Date range parser."""
+
+import datetime
+import dateutil.parser
+import re
+import operator
+
+
+__all__ = ('date_in_range',)
+CLAUSE = re.compile('(year|month|day|hour|minute|second|weekday|isoweekday)?'
+                    ' ?(==|!=|<=|>=|<|>) ?(.*)')
+OPERATORS = {
+    '==': operator.eq,
+    '!=': operator.ne,
+    '<=': operator.le,
+    '>=': operator.ge,
+    '<': operator.lt,
+    '>': operator.gt,
+}
+
+
+def date_in_range(date_range, date, debug=False, now=None):
+    """Check if date is in the range specified.
+
+    Format:
+    * comma-separated clauses (AND)
+    * clause: attribute comparison_operator value (spaces optional)
+        * attribute: year, month, day, hour, month, second, weekday, isoweekday
+          or empty for full datetime
+        * comparison_operator: == != <= >= < >
+        * value: integer, 'now', 'today', or dateutil-compatible date input
+
+    The optional `now` parameter can be used to provide a specific `now`/`today` value
+    (if none is provided, datetime.datetime.now()/datetime.date.today() is used).
+    """
+    out = True
+
+    for item in date_range.split(','):
+        attribute, comparison_operator, value = CLAUSE.match(
+            item.strip()).groups()
+        if attribute in ('weekday', 'isoweekday'):
+            left = getattr(date, attribute)()
+            right = int(value)
+        elif value == 'now':
+            left = date
+            right = now or datetime.datetime.now()
+        elif value == 'today':
+            left = date.date() if isinstance(date, datetime.datetime) else date
+            if now:
+                right = now.date() if isinstance(now, datetime.datetime) else now
+            else:
+                right = datetime.date.today()
+        elif attribute:
+            left = getattr(date, attribute)
+            right = int(value)
+        else:
+            left = date
+            right = dateutil.parser.parse(value)
+        if debug:  # pragma: no cover
+            print("    <{0} {1} {2}>".format(left, comparison_operator, right))
+        out = out and OPERATORS[comparison_operator](left, right)
+    return out