diff --git a/holidays/countries/belarus.py b/holidays/countries/belarus.py
index c8ac62f82..f2b4e609f 100644
--- a/holidays/countries/belarus.py
+++ b/holidays/countries/belarus.py
@@ -11,7 +11,7 @@
 
 from gettext import gettext as tr
 
-from holidays.calendars.gregorian import GREGORIAN_CALENDAR
+from holidays.calendars.gregorian import GREGORIAN_CALENDAR, JAN, MAR, APR, MAY, JUN, JUL, NOV, DEC
 from holidays.calendars.julian import JULIAN_CALENDAR
 from holidays.groups import ChristianHolidays, InternationalHolidays
 from holidays.holiday_base import HolidayBase
@@ -24,11 +24,153 @@ class Belarus(HolidayBase, ChristianHolidays, InternationalHolidays):
     References:
      - http://president.gov.by/en/holidays_en/
      - http://www.belarus.by/en/about-belarus/national-holidays
+     - http://laws.newsby.org/documents/ukazp/pos05/ukaz05806.htm
+     - http://president.gov.by/uploads/documents/2019/464uk.pdf
+     - https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%B0%D0%B7%D0%B4%D0%BD%D0%B8%D0%BA%D0%B8_%D0%91%D0%B5%D0%BB%D0%BE%D1%80%D1%83%D1%81%D1%81%D0%B8%D0%B8  # noqa: E501
     """
 
     country = "BY"
     default_language = "be"
     supported_languages = ("be", "en_US")
+    # Date format (see strftime() Format Codes)
+    substituted_date_format = tr("%d.%m.%Y")
+    # Day off (substituted from %s).
+    substituted_label = tr("Выходны (перанесены з %s)")
+    substituted_holidays = {
+        1998: (
+            (JAN, 10, JAN, 2),
+            (APR, 25, APR, 27),
+        ),
+        1999: (
+            (JAN, 16, JAN, 8),
+            (APR, 17, APR, 19),
+        ),
+        2000: (
+            (MAY, 13, MAY, 8),
+            (NOV, 11, NOV, 6),
+        ),
+        2001: (
+            (JAN, 20, JAN, 2),
+            (MAR, 3, MAR, 9),
+            (APR, 21, APR, 23),
+            (APR, 28, APR, 30),
+            (JUL, 7, JUL, 2),
+            (DEC, 22, DEC, 24),
+            (DEC, 29, DEC, 31),
+        ),
+        2002: (
+            (JAN, 5, JAN, 2),
+            (MAY, 18, MAY, 10),
+            (NOV, 16, NOV, 8),
+        ),
+        2003: (
+            (JAN, 4, JAN, 6),
+            (MAY, 3, MAY, 5),
+        ),
+        2004: (
+            (JAN, 10, JAN, 2),
+            (JAN, 17, JAN, 5),
+            (JAN, 31, JAN, 6),
+            (APR, 17, APR, 19),
+        ),
+        2005: (MAR, 12, MAR, 7),
+        2006: (
+            (JAN, 21, JAN, 2),
+            (MAY, 6, MAY, 8),
+            (NOV, 4, NOV, 6),
+        ),
+        2007: (
+            (2006, DEC, 30, JAN, 2),
+            (MAR, 17, MAR, 9),
+            (APR, 14, APR, 16),
+            (MAY, 5, APR, 30),
+            (JUL, 7, JUL, 2),
+            (DEC, 22, DEC, 24),
+            (DEC, 29, DEC, 31),
+        ),
+        2008: (
+            (JAN, 12, JAN, 2),
+            (MAY, 3, MAY, 5),
+            (JUN, 28, JUL, 4),
+            (DEC, 20, DEC, 26),
+        ),
+        2009: (
+            (JAN, 10, JAN, 2),
+            (APR, 25, APR, 27),
+        ),
+        2010: (
+            (JAN, 23, JAN, 8),
+            (APR, 17, APR, 12),
+            (MAY, 15, MAY, 10),
+        ),
+        2011: (
+            (MAR, 12, MAR, 7),
+            (MAY, 14, MAY, 2),
+        ),
+        2012: (
+            (MAR, 11, MAR, 9),
+            (APR, 28, APR, 23),
+            (JUN, 30, JUL, 2),
+            (DEC, 22, DEC, 24),
+            (DEC, 29, DEC, 31),
+        ),
+        2013: (
+            (JAN, 5, JAN, 2),
+            (MAY, 18, MAY, 10),
+        ),
+        2014: (
+            (JAN, 4, JAN, 2),
+            (JAN, 11, JAN, 6),
+            (MAY, 3, APR, 30),
+            (JUL, 12, JUL, 4),
+            (DEC, 20, DEC, 26),
+        ),
+        2015: (
+            (JAN, 10, JAN, 2),
+            (APR, 25, APR, 20),
+        ),
+        2016: (
+            (JAN, 16, JAN, 8),
+            (MAR, 5, MAR, 7),
+        ),
+        2017: (
+            (JAN, 21, JAN, 2),
+            (APR, 29, APR, 24),
+            (MAY, 6, MAY, 8),
+            (NOV, 4, NOV, 6),
+        ),
+        2018: (
+            (JAN, 20, JAN, 2),
+            (MAR, 3, MAR, 9),
+            (APR, 14, APR, 16),
+            (APR, 28, APR, 30),
+            (JUL, 7, JUL, 2),
+            (DEC, 22, DEC, 24),
+            (DEC, 29, DEC, 31),
+        ),
+        2019: (
+            (MAY, 4, MAY, 6),
+            (MAY, 11, MAY, 8),
+            (NOV, 16, NOV, 8),
+        ),
+        2020: (
+            (JAN, 4, JAN, 6),
+            (APR, 4, APR, 27),
+        ),
+        2021: (
+            (JAN, 16, JAN, 8),
+            (MAY, 15, MAY, 10),
+        ),
+        2022: (
+            (MAR, 12, MAR, 7),
+            (MAY, 14, MAY, 2),
+        ),
+        2023: (
+            (APR, 29, APR, 24),
+            (MAY, 13, MAY, 8),
+            (NOV, 11, NOV, 6),
+        ),
+    }
 
     def __init__(self, *args, **kwargs):
         ChristianHolidays.__init__(self, JULIAN_CALENDAR)
@@ -36,9 +178,8 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
     def _populate(self, year):
-        # The current set of holidays came into force in 1998.
-        # http://laws.newsby.org/documents/ukazp/pos05/ukaz05806.htm
-        if year <= 1998:
+        # The current set of holidays actual from 1998.
+        if year <= 1997:
             return None
 
         super()._populate(year)
@@ -46,8 +187,6 @@ def _populate(self, year):
         # New Year's Day.
         self._add_new_years_day(tr("Новы год"))
 
-        # Jan 2nd is the national holiday (New Year) from 2020.
-        # http://president.gov.by/uploads/documents/2019/464uk.pdf
         if year >= 2020:
             self._add_new_years_day_two(tr("Новы год"))
 
diff --git a/holidays/locale/be/LC_MESSAGES/BY.po b/holidays/locale/be/LC_MESSAGES/BY.po
index eff56c9bc..fe7e9fa9c 100644
--- a/holidays/locale/be/LC_MESSAGES/BY.po
+++ b/holidays/locale/be/LC_MESSAGES/BY.po
@@ -3,18 +3,29 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Python Holidays 0.20\n"
+"Project-Id-Version: Python Holidays 0.34\n"
 "POT-Creation-Date: 2023-02-15 20:06-0800\n"
-"PO-Revision-Date: 2023-02-16 08:45-0800\n"
-"Last-Translator: Arkadii Yakovets <ark@cho.red>\n"
+"PO-Revision-Date: 2023-09-27 18:49+0300\n"
+"Last-Translator: ~Jhellico <jhellico@gmail.com>\n"
 "Language-Team: Python Holidays localization team\n"
 "Language: be\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<12 || "
+"n%100>14) ? 1 : 2);\n"
 "Generated-By: Lingua 4.15.0\n"
 "X-Generator: Poedit 3.2.2\n"
 
+#. Date format (see strftime() Format Codes)
+msgid "%d.%m.%Y"
+msgstr ""
+
+#. Day off (substituted from %s).
+#, c-format
+msgid "Выходны (перанесены з %s)"
+msgstr ""
+
 #. New Year's Day.
 msgid "Новы год"
 msgstr ""
diff --git a/holidays/locale/en_US/LC_MESSAGES/BY.po b/holidays/locale/en_US/LC_MESSAGES/BY.po
index 72dc5ed1d..421e266bd 100644
--- a/holidays/locale/en_US/LC_MESSAGES/BY.po
+++ b/holidays/locale/en_US/LC_MESSAGES/BY.po
@@ -3,18 +3,28 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Python Holidays 0.20\n"
+"Project-Id-Version: Python Holidays 0.34\n"
 "POT-Creation-Date: 2023-02-15 20:06-0800\n"
-"PO-Revision-Date: 2023-02-14 17:52-0800\n"
-"Last-Translator: Arkadii Yakovets <ark@cho.red>\n"
+"PO-Revision-Date: 2023-09-27 18:50+0300\n"
+"Last-Translator: ~Jhellico <jhellico@gmail.com>\n"
 "Language-Team: Python Holidays localization team\n"
 "Language: en_US\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
 "Generated-By: Lingua 4.15.0\n"
 "X-Generator: Poedit 3.2.2\n"
 
+#. Date format (see strftime() Format Codes)
+msgid "%d.%m.%Y"
+msgstr "%m/%d/%Y"
+
+#. Day off (substituted from %s).
+#, c-format
+msgid "Выходны (перанесены з %s)"
+msgstr "Day off (substituted from %s)"
+
 #. New Year's Day.
 msgid "Новы год"
 msgstr "New Year's Day"
diff --git a/snapshots/countries/BY.json b/snapshots/countries/BY.json
index 8634a062d..8b3491216 100644
--- a/snapshots/countries/BY.json
+++ b/snapshots/countries/BY.json
@@ -1,7 +1,20 @@
 {
+    "1998-01-01": "New Year's Day",
+    "1998-01-02": "Day off (substituted from 01/10/1998)",
+    "1998-01-07": "Orthodox Christmas Day",
+    "1998-03-08": "Women's Day",
+    "1998-04-27": "Day off (substituted from 04/25/1998)",
+    "1998-04-28": "Radunitsa",
+    "1998-05-01": "Labor Day",
+    "1998-05-09": "Victory Day",
+    "1998-07-03": "Independence Day (Republic Day)",
+    "1998-11-07": "October Revolution Day",
+    "1998-12-25": "Catholic Christmas Day",
     "1999-01-01": "New Year's Day",
     "1999-01-07": "Orthodox Christmas Day",
+    "1999-01-08": "Day off (substituted from 01/16/1999)",
     "1999-03-08": "Women's Day",
+    "1999-04-19": "Day off (substituted from 04/17/1999)",
     "1999-04-20": "Radunitsa",
     "1999-05-01": "Labor Day",
     "1999-05-09": "Victory Day",
@@ -12,40 +25,58 @@
     "2000-01-07": "Orthodox Christmas Day",
     "2000-03-08": "Women's Day",
     "2000-05-01": "Labor Day",
+    "2000-05-08": "Day off (substituted from 05/13/2000)",
     "2000-05-09": "Radunitsa; Victory Day",
     "2000-07-03": "Independence Day (Republic Day)",
+    "2000-11-06": "Day off (substituted from 11/11/2000)",
     "2000-11-07": "October Revolution Day",
     "2000-12-25": "Catholic Christmas Day",
     "2001-01-01": "New Year's Day",
+    "2001-01-02": "Day off (substituted from 01/20/2001)",
     "2001-01-07": "Orthodox Christmas Day",
     "2001-03-08": "Women's Day",
+    "2001-03-09": "Day off (substituted from 03/03/2001)",
+    "2001-04-23": "Day off (substituted from 04/21/2001)",
     "2001-04-24": "Radunitsa",
+    "2001-04-30": "Day off (substituted from 04/28/2001)",
     "2001-05-01": "Labor Day",
     "2001-05-09": "Victory Day",
+    "2001-07-02": "Day off (substituted from 07/07/2001)",
     "2001-07-03": "Independence Day (Republic Day)",
     "2001-11-07": "October Revolution Day",
+    "2001-12-24": "Day off (substituted from 12/22/2001)",
     "2001-12-25": "Catholic Christmas Day",
+    "2001-12-31": "Day off (substituted from 12/29/2001)",
     "2002-01-01": "New Year's Day",
+    "2002-01-02": "Day off (substituted from 01/05/2002)",
     "2002-01-07": "Orthodox Christmas Day",
     "2002-03-08": "Women's Day",
     "2002-05-01": "Labor Day",
     "2002-05-09": "Victory Day",
+    "2002-05-10": "Day off (substituted from 05/18/2002)",
     "2002-05-14": "Radunitsa",
     "2002-07-03": "Independence Day (Republic Day)",
     "2002-11-07": "October Revolution Day",
+    "2002-11-08": "Day off (substituted from 11/16/2002)",
     "2002-12-25": "Catholic Christmas Day",
     "2003-01-01": "New Year's Day",
+    "2003-01-06": "Day off (substituted from 01/04/2003)",
     "2003-01-07": "Orthodox Christmas Day",
     "2003-03-08": "Women's Day",
     "2003-05-01": "Labor Day",
+    "2003-05-05": "Day off (substituted from 05/03/2003)",
     "2003-05-06": "Radunitsa",
     "2003-05-09": "Victory Day",
     "2003-07-03": "Independence Day (Republic Day)",
     "2003-11-07": "October Revolution Day",
     "2003-12-25": "Catholic Christmas Day",
     "2004-01-01": "New Year's Day",
+    "2004-01-02": "Day off (substituted from 01/10/2004)",
+    "2004-01-05": "Day off (substituted from 01/17/2004)",
+    "2004-01-06": "Day off (substituted from 01/31/2004)",
     "2004-01-07": "Orthodox Christmas Day",
     "2004-03-08": "Women's Day",
+    "2004-04-19": "Day off (substituted from 04/17/2004)",
     "2004-04-20": "Radunitsa",
     "2004-05-01": "Labor Day",
     "2004-05-09": "Victory Day",
@@ -54,6 +85,7 @@
     "2004-12-25": "Catholic Christmas Day",
     "2005-01-01": "New Year's Day",
     "2005-01-07": "Orthodox Christmas Day",
+    "2005-03-07": "Day off (substituted from 03/12/2005)",
     "2005-03-08": "Women's Day",
     "2005-05-01": "Labor Day",
     "2005-05-09": "Victory Day",
@@ -62,35 +94,51 @@
     "2005-11-07": "October Revolution Day",
     "2005-12-25": "Catholic Christmas Day",
     "2006-01-01": "New Year's Day",
+    "2006-01-02": "Day off (substituted from 01/21/2006)",
     "2006-01-07": "Orthodox Christmas Day",
     "2006-03-08": "Women's Day",
     "2006-05-01": "Labor Day",
     "2006-05-02": "Radunitsa",
+    "2006-05-08": "Day off (substituted from 05/06/2006)",
     "2006-05-09": "Victory Day",
     "2006-07-03": "Independence Day (Republic Day)",
+    "2006-11-06": "Day off (substituted from 11/04/2006)",
     "2006-11-07": "October Revolution Day",
     "2006-12-25": "Catholic Christmas Day",
     "2007-01-01": "New Year's Day",
+    "2007-01-02": "Day off (substituted from 12/30/2006)",
     "2007-01-07": "Orthodox Christmas Day",
     "2007-03-08": "Women's Day",
+    "2007-03-09": "Day off (substituted from 03/17/2007)",
+    "2007-04-16": "Day off (substituted from 04/14/2007)",
     "2007-04-17": "Radunitsa",
+    "2007-04-30": "Day off (substituted from 05/05/2007)",
     "2007-05-01": "Labor Day",
     "2007-05-09": "Victory Day",
+    "2007-07-02": "Day off (substituted from 07/07/2007)",
     "2007-07-03": "Independence Day (Republic Day)",
     "2007-11-07": "October Revolution Day",
+    "2007-12-24": "Day off (substituted from 12/22/2007)",
     "2007-12-25": "Catholic Christmas Day",
+    "2007-12-31": "Day off (substituted from 12/29/2007)",
     "2008-01-01": "New Year's Day",
+    "2008-01-02": "Day off (substituted from 01/12/2008)",
     "2008-01-07": "Orthodox Christmas Day",
     "2008-03-08": "Women's Day",
     "2008-05-01": "Labor Day",
+    "2008-05-05": "Day off (substituted from 05/03/2008)",
     "2008-05-06": "Radunitsa",
     "2008-05-09": "Victory Day",
     "2008-07-03": "Independence Day (Republic Day)",
+    "2008-07-04": "Day off (substituted from 06/28/2008)",
     "2008-11-07": "October Revolution Day",
     "2008-12-25": "Catholic Christmas Day",
+    "2008-12-26": "Day off (substituted from 12/20/2008)",
     "2009-01-01": "New Year's Day",
+    "2009-01-02": "Day off (substituted from 01/10/2009)",
     "2009-01-07": "Orthodox Christmas Day",
     "2009-03-08": "Women's Day",
+    "2009-04-27": "Day off (substituted from 04/25/2009)",
     "2009-04-28": "Radunitsa",
     "2009-05-01": "Labor Day",
     "2009-05-09": "Victory Day",
@@ -99,17 +147,22 @@
     "2009-12-25": "Catholic Christmas Day",
     "2010-01-01": "New Year's Day",
     "2010-01-07": "Orthodox Christmas Day",
+    "2010-01-08": "Day off (substituted from 01/23/2010)",
     "2010-03-08": "Women's Day",
+    "2010-04-12": "Day off (substituted from 04/17/2010)",
     "2010-04-13": "Radunitsa",
     "2010-05-01": "Labor Day",
     "2010-05-09": "Victory Day",
+    "2010-05-10": "Day off (substituted from 05/15/2010)",
     "2010-07-03": "Independence Day (Republic Day)",
     "2010-11-07": "October Revolution Day",
     "2010-12-25": "Catholic Christmas Day",
     "2011-01-01": "New Year's Day",
     "2011-01-07": "Orthodox Christmas Day",
+    "2011-03-07": "Day off (substituted from 03/12/2011)",
     "2011-03-08": "Women's Day",
     "2011-05-01": "Labor Day",
+    "2011-05-02": "Day off (substituted from 05/14/2011)",
     "2011-05-03": "Radunitsa",
     "2011-05-09": "Victory Day",
     "2011-07-03": "Independence Day (Republic Day)",
@@ -118,33 +171,47 @@
     "2012-01-01": "New Year's Day",
     "2012-01-07": "Orthodox Christmas Day",
     "2012-03-08": "Women's Day",
+    "2012-03-09": "Day off (substituted from 03/11/2012)",
+    "2012-04-23": "Day off (substituted from 04/28/2012)",
     "2012-04-24": "Radunitsa",
     "2012-05-01": "Labor Day",
     "2012-05-09": "Victory Day",
+    "2012-07-02": "Day off (substituted from 06/30/2012)",
     "2012-07-03": "Independence Day (Republic Day)",
     "2012-11-07": "October Revolution Day",
+    "2012-12-24": "Day off (substituted from 12/22/2012)",
     "2012-12-25": "Catholic Christmas Day",
+    "2012-12-31": "Day off (substituted from 12/29/2012)",
     "2013-01-01": "New Year's Day",
+    "2013-01-02": "Day off (substituted from 01/05/2013)",
     "2013-01-07": "Orthodox Christmas Day",
     "2013-03-08": "Women's Day",
     "2013-05-01": "Labor Day",
     "2013-05-09": "Victory Day",
+    "2013-05-10": "Day off (substituted from 05/18/2013)",
     "2013-05-14": "Radunitsa",
     "2013-07-03": "Independence Day (Republic Day)",
     "2013-11-07": "October Revolution Day",
     "2013-12-25": "Catholic Christmas Day",
     "2014-01-01": "New Year's Day",
+    "2014-01-02": "Day off (substituted from 01/04/2014)",
+    "2014-01-06": "Day off (substituted from 01/11/2014)",
     "2014-01-07": "Orthodox Christmas Day",
     "2014-03-08": "Women's Day",
     "2014-04-29": "Radunitsa",
+    "2014-04-30": "Day off (substituted from 05/03/2014)",
     "2014-05-01": "Labor Day",
     "2014-05-09": "Victory Day",
     "2014-07-03": "Independence Day (Republic Day)",
+    "2014-07-04": "Day off (substituted from 07/12/2014)",
     "2014-11-07": "October Revolution Day",
     "2014-12-25": "Catholic Christmas Day",
+    "2014-12-26": "Day off (substituted from 12/20/2014)",
     "2015-01-01": "New Year's Day",
+    "2015-01-02": "Day off (substituted from 01/10/2015)",
     "2015-01-07": "Orthodox Christmas Day",
     "2015-03-08": "Women's Day",
+    "2015-04-20": "Day off (substituted from 04/25/2015)",
     "2015-04-21": "Radunitsa",
     "2015-05-01": "Labor Day",
     "2015-05-09": "Victory Day",
@@ -153,6 +220,8 @@
     "2015-12-25": "Catholic Christmas Day",
     "2016-01-01": "New Year's Day",
     "2016-01-07": "Orthodox Christmas Day",
+    "2016-01-08": "Day off (substituted from 01/16/2016)",
+    "2016-03-07": "Day off (substituted from 03/05/2016)",
     "2016-03-08": "Women's Day",
     "2016-05-01": "Labor Day",
     "2016-05-09": "Victory Day",
@@ -161,36 +230,52 @@
     "2016-11-07": "October Revolution Day",
     "2016-12-25": "Catholic Christmas Day",
     "2017-01-01": "New Year's Day",
+    "2017-01-02": "Day off (substituted from 01/21/2017)",
     "2017-01-07": "Orthodox Christmas Day",
     "2017-03-08": "Women's Day",
+    "2017-04-24": "Day off (substituted from 04/29/2017)",
     "2017-04-25": "Radunitsa",
     "2017-05-01": "Labor Day",
+    "2017-05-08": "Day off (substituted from 05/06/2017)",
     "2017-05-09": "Victory Day",
     "2017-07-03": "Independence Day (Republic Day)",
+    "2017-11-06": "Day off (substituted from 11/04/2017)",
     "2017-11-07": "October Revolution Day",
     "2017-12-25": "Catholic Christmas Day",
     "2018-01-01": "New Year's Day",
+    "2018-01-02": "Day off (substituted from 01/20/2018)",
     "2018-01-07": "Orthodox Christmas Day",
     "2018-03-08": "Women's Day",
+    "2018-03-09": "Day off (substituted from 03/03/2018)",
+    "2018-04-16": "Day off (substituted from 04/14/2018)",
     "2018-04-17": "Radunitsa",
+    "2018-04-30": "Day off (substituted from 04/28/2018)",
     "2018-05-01": "Labor Day",
     "2018-05-09": "Victory Day",
+    "2018-07-02": "Day off (substituted from 07/07/2018)",
     "2018-07-03": "Independence Day (Republic Day)",
     "2018-11-07": "October Revolution Day",
+    "2018-12-24": "Day off (substituted from 12/22/2018)",
     "2018-12-25": "Catholic Christmas Day",
+    "2018-12-31": "Day off (substituted from 12/29/2018)",
     "2019-01-01": "New Year's Day",
     "2019-01-07": "Orthodox Christmas Day",
     "2019-03-08": "Women's Day",
     "2019-05-01": "Labor Day",
+    "2019-05-06": "Day off (substituted from 05/04/2019)",
     "2019-05-07": "Radunitsa",
+    "2019-05-08": "Day off (substituted from 05/11/2019)",
     "2019-05-09": "Victory Day",
     "2019-07-03": "Independence Day (Republic Day)",
     "2019-11-07": "October Revolution Day",
+    "2019-11-08": "Day off (substituted from 11/16/2019)",
     "2019-12-25": "Catholic Christmas Day",
     "2020-01-01": "New Year's Day",
     "2020-01-02": "New Year's Day",
+    "2020-01-06": "Day off (substituted from 01/04/2020)",
     "2020-01-07": "Orthodox Christmas Day",
     "2020-03-08": "Women's Day",
+    "2020-04-27": "Day off (substituted from 04/04/2020)",
     "2020-04-28": "Radunitsa",
     "2020-05-01": "Labor Day",
     "2020-05-09": "Victory Day",
@@ -200,9 +285,11 @@
     "2021-01-01": "New Year's Day",
     "2021-01-02": "New Year's Day",
     "2021-01-07": "Orthodox Christmas Day",
+    "2021-01-08": "Day off (substituted from 01/16/2021)",
     "2021-03-08": "Women's Day",
     "2021-05-01": "Labor Day",
     "2021-05-09": "Victory Day",
+    "2021-05-10": "Day off (substituted from 05/15/2021)",
     "2021-05-11": "Radunitsa",
     "2021-07-03": "Independence Day (Republic Day)",
     "2021-11-07": "October Revolution Day",
@@ -210,8 +297,10 @@
     "2022-01-01": "New Year's Day",
     "2022-01-02": "New Year's Day",
     "2022-01-07": "Orthodox Christmas Day",
+    "2022-03-07": "Day off (substituted from 03/12/2022)",
     "2022-03-08": "Women's Day",
     "2022-05-01": "Labor Day",
+    "2022-05-02": "Day off (substituted from 05/14/2022)",
     "2022-05-03": "Radunitsa",
     "2022-05-09": "Victory Day",
     "2022-07-03": "Independence Day (Republic Day)",
@@ -221,10 +310,13 @@
     "2023-01-02": "New Year's Day",
     "2023-01-07": "Orthodox Christmas Day",
     "2023-03-08": "Women's Day",
+    "2023-04-24": "Day off (substituted from 04/29/2023)",
     "2023-04-25": "Radunitsa",
     "2023-05-01": "Labor Day",
+    "2023-05-08": "Day off (substituted from 05/13/2023)",
     "2023-05-09": "Victory Day",
     "2023-07-03": "Independence Day (Republic Day)",
+    "2023-11-06": "Day off (substituted from 11/11/2023)",
     "2023-11-07": "October Revolution Day",
     "2023-12-25": "Catholic Christmas Day",
     "2024-01-01": "New Year's Day",
diff --git a/tests/countries/test_belarus.py b/tests/countries/test_belarus.py
index eac61e880..811750aec 100644
--- a/tests/countries/test_belarus.py
+++ b/tests/countries/test_belarus.py
@@ -21,6 +21,9 @@ def setUpClass(cls):
     def test_country_aliases(self):
         self.assertCountryAliases(Belarus, BY, BLR)
 
+    def test_no_holidays(self):
+        self.assertNoHolidays(Belarus(years=1997))
+
     def test_2018(self):
         # http://calendar.by/procal.php?year=2018
         # https://www.officeholidays.com/countries/belarus/index.php
@@ -71,22 +74,105 @@ def test_radunitsa(self):
             "2030-05-07",
         )
 
-    def test_pre_1998(self):
-        self.assertNoHoliday("1997-07-03")
+    def test_substituted(self):
+        self.assertHoliday(
+            "1998-01-02",
+            "1998-04-27",
+            "1999-01-08",
+            "1999-04-19",
+            "2000-05-08",
+            "2000-11-06",
+            "2001-01-02",
+            "2001-03-09",
+            "2001-04-23",
+            "2001-04-30",
+            "2001-07-02",
+            "2001-12-24",
+            "2001-12-31",
+            "2002-01-02",
+            "2002-05-10",
+            "2002-11-08",
+            "2003-01-06",
+            "2003-05-05",
+            "2004-01-02",
+            "2004-01-05",
+            "2004-01-06",
+            "2004-04-19",
+            "2005-03-07",
+            "2006-01-02",
+            "2006-05-08",
+            "2006-11-06",
+            "2007-01-02",
+            "2007-03-09",
+            "2007-04-16",
+            "2007-04-30",
+            "2007-07-02",
+            "2007-12-24",
+            "2007-12-31",
+            "2008-01-02",
+            "2008-05-05",
+            "2008-07-04",
+            "2008-12-26",
+            "2009-01-02",
+            "2009-04-27",
+            "2010-01-08",
+            "2010-04-12",
+            "2010-05-10",
+            "2011-03-07",
+            "2011-05-02",
+            "2012-03-09",
+            "2012-04-23",
+            "2012-07-02",
+            "2012-12-24",
+            "2012-12-31",
+            "2013-01-02",
+            "2013-05-10",
+            "2014-01-02",
+            "2014-01-06",
+            "2014-04-30",
+            "2014-07-04",
+            "2014-12-26",
+            "2015-01-02",
+            "2015-04-20",
+            "2016-01-08",
+            "2016-03-07",
+            "2017-01-02",
+            "2017-04-24",
+            "2017-05-08",
+            "2017-11-06",
+            "2018-01-02",
+            "2018-03-09",
+            "2018-04-16",
+            "2018-04-30",
+            "2018-07-02",
+            "2018-12-24",
+            "2018-12-31",
+            "2019-05-06",
+            "2019-05-08",
+            "2019-11-08",
+            "2020-01-06",
+            "2020-04-27",
+            "2021-01-08",
+            "2021-05-10",
+            "2022-03-07",
+            "2022-05-02",
+            "2023-04-24",
+            "2023-05-08",
+            "2023-11-06",
+        )
 
     def test_l10n_default(self):
         self.assertLocalizedHolidays(
             ("2022-01-01", "Новы год"),
             ("2022-01-02", "Новы год"),
             ("2022-01-07", "Нараджэнне Хрыстова (праваслаўнае Раство)"),
+            ("2022-03-07", "Выходны (перанесены з 12.03.2022)"),
             ("2022-03-08", "Дзень жанчын"),
             ("2022-05-01", "Свята працы"),
+            ("2022-05-02", "Выходны (перанесены з 14.05.2022)"),
             ("2022-05-03", "Радаўніца"),
             ("2022-05-09", "Дзень Перамогі"),
-            (
-                "2022-07-03",
-                "Дзень Незалежнасці Рэспублікі Беларусь (Дзень Рэспублікі)",
-            ),
+            ("2022-07-03", "Дзень Незалежнасці Рэспублікі Беларусь (Дзень Рэспублікі)"),
             ("2022-11-07", "Дзень Кастрычніцкай рэвалюцыі"),
             ("2022-12-25", "Нараджэнне Хрыстова (каталіцкае Раство)"),
         )
@@ -97,8 +183,10 @@ def test_l10n_en_us(self):
             ("2022-01-01", "New Year's Day"),
             ("2022-01-02", "New Year's Day"),
             ("2022-01-07", "Orthodox Christmas Day"),
+            ("2022-03-07", "Day off (substituted from 03/12/2022)"),
             ("2022-03-08", "Women's Day"),
             ("2022-05-01", "Labor Day"),
+            ("2022-05-02", "Day off (substituted from 05/14/2022)"),
             ("2022-05-03", "Radunitsa"),
             ("2022-05-09", "Victory Day"),
             ("2022-07-03", "Independence Day (Republic Day)"),