México

Business days calculator

Count working days in México (no Saturdays, Sundays or holidays)

Between two dates Add business days

Count working days in México (no Saturdays, Sundays or holidays)

This month Next 30 days Until year end +10 business days +15 business days +30 business days

14311

business days

From January 1, 1970 to July 26, 2026

We swapped the dates because “to” was earlier than “from”.

Business day 14311
Weekend 5904
Holidays 446

20661 days in the period

20661

Total days

5904

Weekend

446

Holidays

Holidays in the period

New Year's Day Thu 1 Jan 1970
Constitution Day Mon 2 Feb 1970
Benito Juárez's Birthday Mon 16 Mar 1970
Maundy Thursday Thu 26 Mar 1970
Good Friday Fri 27 Mar 1970
Labour Day Fri 1 May 1970
Independence Day Wed 16 Sep 1970
Revolution Day Mon 16 Nov 1970
Christmas Day Fri 25 Dec 1970
New Year's Day Fri 1 Jan 1971
Constitution Day Mon 1 Feb 1971
Benito Juárez's Birthday Mon 15 Mar 1971
Maundy Thursday Thu 8 Apr 1971
Good Friday Fri 9 Apr 1971
Labour Day Sat 1 May 1971
Independence Day Thu 16 Sep 1971
Revolution Day Mon 15 Nov 1971
Christmas Day Sat 25 Dec 1971
New Year's Day Sat 1 Jan 1972
Constitution Day Mon 7 Feb 1972
Benito Juárez's Birthday Mon 20 Mar 1972
Maundy Thursday Thu 30 Mar 1972
Good Friday Fri 31 Mar 1972
Labour Day Mon 1 May 1972
Independence Day Sat 16 Sep 1972
Revolution Day Mon 20 Nov 1972
Christmas Day Mon 25 Dec 1972
New Year's Day Mon 1 Jan 1973
Constitution Day Mon 5 Feb 1973
Benito Juárez's Birthday Mon 19 Mar 1973
Maundy Thursday Thu 19 Apr 1973
Good Friday Fri 20 Apr 1973
Labour Day Tue 1 May 1973
Independence Day Sun 16 Sep 1973
Revolution Day Mon 19 Nov 1973
Christmas Day Tue 25 Dec 1973
New Year's Day Tue 1 Jan 1974
Constitution Day Mon 4 Feb 1974
Benito Juárez's Birthday Mon 18 Mar 1974
Maundy Thursday Thu 11 Apr 1974
Good Friday Fri 12 Apr 1974
Labour Day Wed 1 May 1974
Independence Day Mon 16 Sep 1974
Revolution Day Mon 18 Nov 1974
Christmas Day Wed 25 Dec 1974
New Year's Day Wed 1 Jan 1975
Constitution Day Mon 3 Feb 1975
Benito Juárez's Birthday Mon 17 Mar 1975
Maundy Thursday Thu 27 Mar 1975
Good Friday Fri 28 Mar 1975
Labour Day Thu 1 May 1975
Independence Day Tue 16 Sep 1975
Revolution Day Mon 17 Nov 1975
Christmas Day Thu 25 Dec 1975
New Year's Day Thu 1 Jan 1976
Constitution Day Mon 2 Feb 1976
Benito Juárez's Birthday Mon 15 Mar 1976
Maundy Thursday Thu 15 Apr 1976
Good Friday Fri 16 Apr 1976
Labour Day Sat 1 May 1976
Independence Day Thu 16 Sep 1976
Revolution Day Mon 15 Nov 1976
Christmas Day Sat 25 Dec 1976
New Year's Day Sat 1 Jan 1977
Constitution Day Mon 7 Feb 1977
Benito Juárez's Birthday Mon 21 Mar 1977
Maundy Thursday Thu 7 Apr 1977
Good Friday Fri 8 Apr 1977
Labour Day Sun 1 May 1977
Independence Day Fri 16 Sep 1977
Revolution Day Mon 21 Nov 1977
Christmas Day Sun 25 Dec 1977
New Year's Day Sun 1 Jan 1978
Constitution Day Mon 6 Feb 1978
Benito Juárez's Birthday Mon 20 Mar 1978
Maundy Thursday Thu 23 Mar 1978
Good Friday Fri 24 Mar 1978
Labour Day Mon 1 May 1978
Independence Day Sat 16 Sep 1978
Revolution Day Mon 20 Nov 1978
Christmas Day Mon 25 Dec 1978
New Year's Day Mon 1 Jan 1979
Constitution Day Mon 5 Feb 1979
Benito Juárez's Birthday Mon 19 Mar 1979
Maundy Thursday Thu 12 Apr 1979
Good Friday Fri 13 Apr 1979
Labour Day Tue 1 May 1979
Independence Day Sun 16 Sep 1979
Revolution Day Mon 19 Nov 1979
Christmas Day Tue 25 Dec 1979
New Year's Day Tue 1 Jan 1980
Constitution Day Mon 4 Feb 1980
Benito Juárez's Birthday Mon 17 Mar 1980
Maundy Thursday Thu 3 Apr 1980
Good Friday Fri 4 Apr 1980
Labour Day Thu 1 May 1980
Independence Day Tue 16 Sep 1980
Revolution Day Mon 17 Nov 1980
Christmas Day Thu 25 Dec 1980
New Year's Day Thu 1 Jan 1981
Constitution Day Mon 2 Feb 1981
Benito Juárez's Birthday Mon 16 Mar 1981
Maundy Thursday Thu 16 Apr 1981
Good Friday Fri 17 Apr 1981
Labour Day Fri 1 May 1981
Independence Day Wed 16 Sep 1981
Revolution Day Mon 16 Nov 1981
Christmas Day Fri 25 Dec 1981
New Year's Day Fri 1 Jan 1982
Constitution Day Mon 1 Feb 1982
Benito Juárez's Birthday Mon 15 Mar 1982
Maundy Thursday Thu 8 Apr 1982
Good Friday Fri 9 Apr 1982
Labour Day Sat 1 May 1982
Independence Day Thu 16 Sep 1982
Revolution Day Mon 15 Nov 1982
Christmas Day Sat 25 Dec 1982
New Year's Day Sat 1 Jan 1983
Constitution Day Mon 7 Feb 1983
Benito Juárez's Birthday Mon 21 Mar 1983
Maundy Thursday Thu 31 Mar 1983
Good Friday Fri 1 Apr 1983
Labour Day Sun 1 May 1983
Independence Day Fri 16 Sep 1983
Revolution Day Mon 21 Nov 1983
Christmas Day Sun 25 Dec 1983
New Year's Day Sun 1 Jan 1984
Constitution Day Mon 6 Feb 1984
Benito Juárez's Birthday Mon 19 Mar 1984
Maundy Thursday Thu 19 Apr 1984
Good Friday Fri 20 Apr 1984
Labour Day Tue 1 May 1984
Independence Day Sun 16 Sep 1984
Revolution Day Mon 19 Nov 1984
Christmas Day Tue 25 Dec 1984
New Year's Day Tue 1 Jan 1985
Constitution Day Mon 4 Feb 1985
Benito Juárez's Birthday Mon 18 Mar 1985
Maundy Thursday Thu 4 Apr 1985
Good Friday Fri 5 Apr 1985
Labour Day Wed 1 May 1985
Independence Day Mon 16 Sep 1985
Revolution Day Mon 18 Nov 1985
Christmas Day Wed 25 Dec 1985
New Year's Day Wed 1 Jan 1986
Constitution Day Mon 3 Feb 1986
Benito Juárez's Birthday Mon 17 Mar 1986
Maundy Thursday Thu 27 Mar 1986
Good Friday Fri 28 Mar 1986
Labour Day Thu 1 May 1986
Independence Day Tue 16 Sep 1986
Revolution Day Mon 17 Nov 1986
Christmas Day Thu 25 Dec 1986
New Year's Day Thu 1 Jan 1987
Constitution Day Mon 2 Feb 1987
Benito Juárez's Birthday Mon 16 Mar 1987
Maundy Thursday Thu 16 Apr 1987
Good Friday Fri 17 Apr 1987
Labour Day Fri 1 May 1987
Independence Day Wed 16 Sep 1987
Revolution Day Mon 16 Nov 1987
Christmas Day Fri 25 Dec 1987
New Year's Day Fri 1 Jan 1988
Constitution Day Mon 1 Feb 1988
Benito Juárez's Birthday Mon 21 Mar 1988
Maundy Thursday Thu 31 Mar 1988
Good Friday Fri 1 Apr 1988
Labour Day Sun 1 May 1988
Independence Day Fri 16 Sep 1988
Revolution Day Mon 21 Nov 1988
Christmas Day Sun 25 Dec 1988
New Year's Day Sun 1 Jan 1989
Constitution Day Mon 6 Feb 1989
Benito Juárez's Birthday Mon 20 Mar 1989
Maundy Thursday Thu 23 Mar 1989
Good Friday Fri 24 Mar 1989
Labour Day Mon 1 May 1989
Independence Day Sat 16 Sep 1989
Revolution Day Mon 20 Nov 1989
Christmas Day Mon 25 Dec 1989
New Year's Day Mon 1 Jan 1990
Constitution Day Mon 5 Feb 1990
Benito Juárez's Birthday Mon 19 Mar 1990
Maundy Thursday Thu 12 Apr 1990
Good Friday Fri 13 Apr 1990
Labour Day Tue 1 May 1990
Independence Day Sun 16 Sep 1990
Revolution Day Mon 19 Nov 1990
Christmas Day Tue 25 Dec 1990
New Year's Day Tue 1 Jan 1991
Constitution Day Mon 4 Feb 1991
Benito Juárez's Birthday Mon 18 Mar 1991
Maundy Thursday Thu 28 Mar 1991
Good Friday Fri 29 Mar 1991
Labour Day Wed 1 May 1991
Independence Day Mon 16 Sep 1991
Revolution Day Mon 18 Nov 1991
Christmas Day Wed 25 Dec 1991
New Year's Day Wed 1 Jan 1992
Constitution Day Mon 3 Feb 1992
Benito Juárez's Birthday Mon 16 Mar 1992
Maundy Thursday Thu 16 Apr 1992
Good Friday Fri 17 Apr 1992
Labour Day Fri 1 May 1992
Independence Day Wed 16 Sep 1992
Revolution Day Mon 16 Nov 1992
Christmas Day Fri 25 Dec 1992
New Year's Day Fri 1 Jan 1993
Constitution Day Mon 1 Feb 1993
Benito Juárez's Birthday Mon 15 Mar 1993
Maundy Thursday Thu 8 Apr 1993
Good Friday Fri 9 Apr 1993
Labour Day Sat 1 May 1993
Independence Day Thu 16 Sep 1993
Revolution Day Mon 15 Nov 1993
Christmas Day Sat 25 Dec 1993
New Year's Day Sat 1 Jan 1994
Constitution Day Mon 7 Feb 1994
Benito Juárez's Birthday Mon 21 Mar 1994
Maundy Thursday Thu 31 Mar 1994
Good Friday Fri 1 Apr 1994
Labour Day Sun 1 May 1994
Independence Day Fri 16 Sep 1994
Revolution Day Mon 21 Nov 1994
Christmas Day Sun 25 Dec 1994
New Year's Day Sun 1 Jan 1995
Constitution Day Mon 6 Feb 1995
Benito Juárez's Birthday Mon 20 Mar 1995
Maundy Thursday Thu 13 Apr 1995
Good Friday Fri 14 Apr 1995
Labour Day Mon 1 May 1995
Independence Day Sat 16 Sep 1995
Revolution Day Mon 20 Nov 1995
Christmas Day Mon 25 Dec 1995
New Year's Day Mon 1 Jan 1996
Constitution Day Mon 5 Feb 1996
Benito Juárez's Birthday Mon 18 Mar 1996
Maundy Thursday Thu 4 Apr 1996
Good Friday Fri 5 Apr 1996
Labour Day Wed 1 May 1996
Independence Day Mon 16 Sep 1996
Revolution Day Mon 18 Nov 1996
Christmas Day Wed 25 Dec 1996
New Year's Day Wed 1 Jan 1997
Constitution Day Mon 3 Feb 1997
Benito Juárez's Birthday Mon 17 Mar 1997
Maundy Thursday Thu 27 Mar 1997
Good Friday Fri 28 Mar 1997
Labour Day Thu 1 May 1997
Independence Day Tue 16 Sep 1997
Revolution Day Mon 17 Nov 1997
Christmas Day Thu 25 Dec 1997
New Year's Day Thu 1 Jan 1998
Constitution Day Mon 2 Feb 1998
Benito Juárez's Birthday Mon 16 Mar 1998
Maundy Thursday Thu 9 Apr 1998
Good Friday Fri 10 Apr 1998
Labour Day Fri 1 May 1998
Independence Day Wed 16 Sep 1998
Revolution Day Mon 16 Nov 1998
Christmas Day Fri 25 Dec 1998
New Year's Day Fri 1 Jan 1999
Constitution Day Mon 1 Feb 1999
Benito Juárez's Birthday Mon 15 Mar 1999
Maundy Thursday Thu 1 Apr 1999
Good Friday Fri 2 Apr 1999
Labour Day Sat 1 May 1999
Independence Day Thu 16 Sep 1999
Revolution Day Mon 15 Nov 1999
Christmas Day Sat 25 Dec 1999
New Year's Day Sat 1 Jan 2000
Constitution Day Mon 7 Feb 2000
Benito Juárez's Birthday Mon 20 Mar 2000
Maundy Thursday Thu 20 Apr 2000
Good Friday Fri 21 Apr 2000
Labour Day Mon 1 May 2000
Independence Day Sat 16 Sep 2000
Revolution Day Mon 20 Nov 2000
Christmas Day Mon 25 Dec 2000
New Year's Day Mon 1 Jan 2001
Constitution Day Mon 5 Feb 2001
Benito Juárez's Birthday Mon 19 Mar 2001
Maundy Thursday Thu 12 Apr 2001
Good Friday Fri 13 Apr 2001
Labour Day Tue 1 May 2001
Independence Day Sun 16 Sep 2001
Revolution Day Mon 19 Nov 2001
Christmas Day Tue 25 Dec 2001
New Year's Day Tue 1 Jan 2002
Constitution Day Mon 4 Feb 2002
Benito Juárez's Birthday Mon 18 Mar 2002
Maundy Thursday Thu 28 Mar 2002
Good Friday Fri 29 Mar 2002
Labour Day Wed 1 May 2002
Independence Day Mon 16 Sep 2002
Revolution Day Mon 18 Nov 2002
Christmas Day Wed 25 Dec 2002
New Year's Day Wed 1 Jan 2003
Constitution Day Mon 3 Feb 2003
Benito Juárez's Birthday Mon 17 Mar 2003
Maundy Thursday Thu 17 Apr 2003
Good Friday Fri 18 Apr 2003
Labour Day Thu 1 May 2003
Independence Day Tue 16 Sep 2003
Revolution Day Mon 17 Nov 2003
Christmas Day Thu 25 Dec 2003
New Year's Day Thu 1 Jan 2004
Constitution Day Mon 2 Feb 2004
Benito Juárez's Birthday Mon 15 Mar 2004
Maundy Thursday Thu 8 Apr 2004
Good Friday Fri 9 Apr 2004
Labour Day Sat 1 May 2004
Independence Day Thu 16 Sep 2004
Revolution Day Mon 15 Nov 2004
Christmas Day Sat 25 Dec 2004
New Year's Day Sat 1 Jan 2005
Constitution Day Mon 7 Feb 2005
Benito Juárez's Birthday Mon 21 Mar 2005
Maundy Thursday Thu 24 Mar 2005
Good Friday Fri 25 Mar 2005
Labour Day Sun 1 May 2005
Independence Day Fri 16 Sep 2005
Revolution Day Mon 21 Nov 2005
Christmas Day Sun 25 Dec 2005
New Year's Day Sun 1 Jan 2006
Constitution Day Mon 6 Feb 2006
Benito Juárez's Birthday Mon 20 Mar 2006
Maundy Thursday Thu 13 Apr 2006
Good Friday Fri 14 Apr 2006
Labour Day Mon 1 May 2006
Independence Day Sat 16 Sep 2006
Revolution Day Mon 20 Nov 2006
Christmas Day Mon 25 Dec 2006
New Year's Day Mon 1 Jan 2007
Constitution Day Mon 5 Feb 2007
Benito Juárez's Birthday Mon 19 Mar 2007
Maundy Thursday Thu 5 Apr 2007
Good Friday Fri 6 Apr 2007
Labour Day Tue 1 May 2007
Independence Day Sun 16 Sep 2007
Revolution Day Mon 19 Nov 2007
Christmas Day Tue 25 Dec 2007
New Year's Day Tue 1 Jan 2008
Constitution Day Mon 4 Feb 2008
Benito Juárez's Birthday Mon 17 Mar 2008
Maundy Thursday Thu 20 Mar 2008
Good Friday Fri 21 Mar 2008
Labour Day Thu 1 May 2008
Independence Day Tue 16 Sep 2008
Revolution Day Mon 17 Nov 2008
Christmas Day Thu 25 Dec 2008
New Year's Day Thu 1 Jan 2009
Constitution Day Mon 2 Feb 2009
Benito Juárez's Birthday Mon 16 Mar 2009
Maundy Thursday Thu 9 Apr 2009
Good Friday Fri 10 Apr 2009
Labour Day Fri 1 May 2009
Independence Day Wed 16 Sep 2009
Revolution Day Mon 16 Nov 2009
Christmas Day Fri 25 Dec 2009
New Year's Day Fri 1 Jan 2010
Constitution Day Mon 1 Feb 2010
Benito Juárez's Birthday Mon 15 Mar 2010
Maundy Thursday Thu 1 Apr 2010
Good Friday Fri 2 Apr 2010
Labour Day Sat 1 May 2010
Independence Day Thu 16 Sep 2010
Revolution Day Mon 15 Nov 2010
Christmas Day Sat 25 Dec 2010
New Year's Day Sat 1 Jan 2011
Constitution Day Mon 7 Feb 2011
Benito Juárez's Birthday Mon 21 Mar 2011
Maundy Thursday Thu 21 Apr 2011
Good Friday Fri 22 Apr 2011
Labour Day Sun 1 May 2011
Independence Day Fri 16 Sep 2011
Revolution Day Mon 21 Nov 2011
Christmas Day Sun 25 Dec 2011
New Year's Day Sun 1 Jan 2012
Constitution Day Mon 6 Feb 2012
Benito Juárez's Birthday Mon 19 Mar 2012
Maundy Thursday Thu 5 Apr 2012
Good Friday Fri 6 Apr 2012
Labour Day Tue 1 May 2012
Independence Day Sun 16 Sep 2012
Revolution Day Mon 19 Nov 2012
Christmas Day Tue 25 Dec 2012
New Year's Day Tue 1 Jan 2013
Constitution Day Mon 4 Feb 2013
Benito Juárez's Birthday Mon 18 Mar 2013
Maundy Thursday Thu 28 Mar 2013
Good Friday Fri 29 Mar 2013
Labour Day Wed 1 May 2013
Independence Day Mon 16 Sep 2013
Revolution Day Mon 18 Nov 2013
Christmas Day Wed 25 Dec 2013
New Year's Day Wed 1 Jan 2014
Constitution Day Mon 3 Feb 2014
Benito Juárez's Birthday Mon 17 Mar 2014
Maundy Thursday Thu 17 Apr 2014
Good Friday Fri 18 Apr 2014
Labour Day Thu 1 May 2014
Independence Day Tue 16 Sep 2014
Revolution Day Mon 17 Nov 2014
Christmas Day Thu 25 Dec 2014
New Year's Day Thu 1 Jan 2015
Constitution Day Mon 2 Feb 2015
Benito Juárez's Birthday Mon 16 Mar 2015
Maundy Thursday Thu 2 Apr 2015
Good Friday Fri 3 Apr 2015
Labour Day Fri 1 May 2015
Independence Day Wed 16 Sep 2015
Revolution Day Mon 16 Nov 2015
Christmas Day Fri 25 Dec 2015
New Year's Day Fri 1 Jan 2016
Constitution Day Mon 1 Feb 2016
Benito Juárez's Birthday Mon 21 Mar 2016
Maundy Thursday Thu 24 Mar 2016
Good Friday Fri 25 Mar 2016
Labour Day Sun 1 May 2016
Independence Day Fri 16 Sep 2016
Revolution Day Mon 21 Nov 2016
Christmas Day Sun 25 Dec 2016
New Year's Day Sun 1 Jan 2017
Constitution Day Mon 6 Feb 2017
Benito Juárez's Birthday Mon 20 Mar 2017
Maundy Thursday Thu 13 Apr 2017
Good Friday Fri 14 Apr 2017
Labour Day Mon 1 May 2017
Independence Day Sat 16 Sep 2017
Revolution Day Mon 20 Nov 2017
Christmas Day Mon 25 Dec 2017
New Year's Day Mon 1 Jan 2018
Constitution Day Mon 5 Feb 2018
Benito Juárez's Birthday Mon 19 Mar 2018
Maundy Thursday Thu 29 Mar 2018
Good Friday Fri 30 Mar 2018
Labour Day Tue 1 May 2018
Independence Day Sun 16 Sep 2018
Revolution Day Mon 19 Nov 2018
Christmas Day Tue 25 Dec 2018
New Year's Day Tue 1 Jan 2019
Constitution Day Mon 4 Feb 2019
Benito Juárez's Birthday Mon 18 Mar 2019
Maundy Thursday Thu 18 Apr 2019
Good Friday Fri 19 Apr 2019
Labour Day Wed 1 May 2019
Independence Day Mon 16 Sep 2019
Revolution Day Mon 18 Nov 2019
Christmas Day Wed 25 Dec 2019
New Year's Day Wed 1 Jan 2020
Constitution Day Mon 3 Feb 2020
Benito Juárez's Birthday Mon 16 Mar 2020
Maundy Thursday Thu 9 Apr 2020
Good Friday Fri 10 Apr 2020
Labour Day Fri 1 May 2020
Independence Day Wed 16 Sep 2020
Revolution Day Mon 16 Nov 2020
Christmas Day Fri 25 Dec 2020
New Year's Day Fri 1 Jan 2021
Constitution Day Mon 1 Feb 2021
Benito Juárez's Birthday Mon 15 Mar 2021
Maundy Thursday Thu 1 Apr 2021
Good Friday Fri 2 Apr 2021
Labour Day Sat 1 May 2021
Independence Day Thu 16 Sep 2021
Revolution Day Mon 15 Nov 2021
Christmas Day Sat 25 Dec 2021
New Year's Day Sat 1 Jan 2022
Constitution Day Mon 7 Feb 2022
Benito Juárez's Birthday Mon 21 Mar 2022
Maundy Thursday Thu 14 Apr 2022
Good Friday Fri 15 Apr 2022
Labour Day Sun 1 May 2022
Independence Day Fri 16 Sep 2022
Revolution Day Mon 21 Nov 2022
Christmas Day Sun 25 Dec 2022
New Year's Day Sun 1 Jan 2023
Constitution Day Mon 6 Feb 2023
Benito Juárez's Birthday Mon 20 Mar 2023
Maundy Thursday Thu 6 Apr 2023
Good Friday Fri 7 Apr 2023
Labour Day Mon 1 May 2023
Independence Day Sat 16 Sep 2023
Revolution Day Mon 20 Nov 2023
Christmas Day Mon 25 Dec 2023
New Year's Day Mon 1 Jan 2024
Constitution Day Mon 5 Feb 2024
Benito Juárez's Birthday Mon 18 Mar 2024
Maundy Thursday Thu 28 Mar 2024
Good Friday Fri 29 Mar 2024
Labour Day Wed 1 May 2024
Independence Day Mon 16 Sep 2024
Revolution Day Mon 18 Nov 2024
Christmas Day Wed 25 Dec 2024
New Year's Day Wed 1 Jan 2025
Constitution Day Mon 3 Feb 2025
Benito Juárez's Birthday Mon 17 Mar 2025
Maundy Thursday Thu 17 Apr 2025
Good Friday Fri 18 Apr 2025
Labour Day Thu 1 May 2025
Independence Day Tue 16 Sep 2025
Revolution Day Mon 17 Nov 2025
Christmas Day Thu 25 Dec 2025
New Year's Day Thu 1 Jan 2026
Constitution Day Mon 2 Feb 2026
Benito Juárez's Birthday Mon 16 Mar 2026
Maundy Thursday Thu 2 Apr 2026
Good Friday Fri 3 Apr 2026
Labour Day Fri 1 May 2026

Preguntas frecuentes

What counts as a business day?

In CivicCalendar a business day is a Monday–Friday that is not a legal holiday in México. Saturdays and Sundays are not counted.

Is the start day included?

Yes. In “Between two dates” mode both dates are inclusive. In “Add business days”, counting starts on the start date if that date is a business day.

Are regional holidays considered?

National holidays and regional holidays defined for the country are used. If a regional holiday does not apply to your area, the result may differ.

Is this an official calculation?

It is indicative according to current legislation and calendars loaded on the site. For critical legal or labor deadlines, confirm with the relevant rule or authority.