Create a monthly datetime sequence

2021 3 12
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更新时间：2021 3 12
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Hello everyone,
Can someone please me explain why this code
a=datetime(1981,1,1);
b=datetime(2019,31,1);
t1=a:calmonths(1):b;
t2=datetime(t1,'Format','yyyy-M-d');
M=datevec(t2);
Gives me monthly dates until july 2021? Am I missing something?
Thank you!

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Stephen23
Stephen23 2021-3-12
Ran in:
Ran in:
t1.Format = 'yyyy-M-d' % the correct way to set the format.
t1 = 1×457 datetime array
1981-1-1 1981-2-1 1981-3-1 1981-4-1 1981-5-1 1981-6-1 1981-7-1 1981-8-1 1981-9-1 1981-10-1 1981-11-1 1981-12-1 1982-1-1 1982-2-1 1982-3-1 1982-4-1 1982-5-1 1982-6-1 1982-7-1 1982-8-1 1982-9-1 1982-10-1 1982-11-1 1982-12-1 1983-1-1 1983-2-1 1983-3-1 1983-4-1 1983-5-1 1983-6-1 1983-7-1 1983-8-1 1983-9-1 1983-10-1 1983-11-1 1983-12-1 1984-1-1 1984-2-1 1984-3-1 1984-4-1 1984-5-1 1984-6-1 1984-7-1 1984-8-1 1984-9-1 1984-10-1 1984-11-1 1984-12-1 1985-1-1 1985-2-1 1985-3-1 1985-4-1 1985-5-1 1985-6-1 1985-7-1 1985-8-1 1985-9-1 1985-10-1 1985-11-1 1985-12-1 1986-1-1 1986-2-1 1986-3-1 1986-4-1 1986-5-1 1986-6-1 1986-7-1 1986-8-1 1986-9-1 1986-10-1 1986-11-1 1986-12-1 1987-1-1 1987-2-1 1987-3-1 1987-4-1 1987-5-1 1987-6-1 1987-7-1 1987-8-1 1987-9-1 1987-10-1 1987-11-1 1987-12-1 1988-1-1 1988-2-1 1988-3-1 1988-4-1 1988-5-1 1988-6-1 1988-7-1 1988-8-1 1988-9-1 1988-10-1 1988-11-1 1988-12-1 1989-1-1 1989-2-1 1989-3-1 1989-4-1 1989-5-1 1989-6-1 1989-7-1 1989-8-1 1989-9-1 1989-10-1 1989-11-1 1989-12-1 1990-1-1 1990-2-1 1990-3-1 1990-4-1 1990-5-1 1990-6-1 1990-7-1 1990-8-1 1990-9-1 1990-10-1 1990-11-1 1990-12-1 1991-1-1 1991-2-1 1991-3-1 1991-4-1 1991-5-1 1991-6-1 1991-7-1 1991-8-1 1991-9-1 1991-10-1 1991-11-1 1991-12-1 1992-1-1 1992-2-1 1992-3-1 1992-4-1 1992-5-1 1992-6-1 1992-7-1 1992-8-1 1992-9-1 1992-10-1 1992-11-1 1992-12-1 1993-1-1 1993-2-1 1993-3-1 1993-4-1 1993-5-1 1993-6-1 1993-7-1 1993-8-1 1993-9-1 1993-10-1 1993-11-1 1993-12-1 1994-1-1 1994-2-1 1994-3-1 1994-4-1 1994-5-1 1994-6-1 1994-7-1 1994-8-1 1994-9-1 1994-10-1 1994-11-1 1994-12-1 1995-1-1 1995-2-1 1995-3-1 1995-4-1 1995-5-1 1995-6-1 1995-7-1 1995-8-1 1995-9-1 1995-10-1 1995-11-1 1995-12-1 1996-1-1 1996-2-1 1996-3-1 1996-4-1 1996-5-1 1996-6-1 1996-7-1 1996-8-1 1996-9-1 1996-10-1 1996-11-1 1996-12-1 1997-1-1 1997-2-1 1997-3-1 1997-4-1 1997-5-1 1997-6-1 1997-7-1 1997-8-1 1997-9-1 1997-10-1 1997-11-1 1997-12-1 1998-1-1 1998-2-1 1998-3-1 1998-4-1 1998-5-1 1998-6-1 1998-7-1 1998-8-1 1998-9-1 1998-10-1 1998-11-1 1998-12-1 1999-1-1 1999-2-1 1999-3-1 1999-4-1 1999-5-1 1999-6-1 1999-7-1 1999-8-1 1999-9-1 1999-10-1 1999-11-1 1999-12-1 2000-1-1 2000-2-1 2000-3-1 2000-4-1 2000-5-1 2000-6-1 2000-7-1 2000-8-1 2000-9-1 2000-10-1 2000-11-1 2000-12-1 2001-1-1 2001-2-1 2001-3-1 2001-4-1 2001-5-1 2001-6-1 2001-7-1 2001-8-1 2001-9-1 2001-10-1 2001-11-1 2001-12-1 2002-1-1 2002-2-1 2002-3-1 2002-4-1 2002-5-1 2002-6-1 2002-7-1 2002-8-1 2002-9-1 2002-10-1 2002-11-1 2002-12-1 2003-1-1 2003-2-1 2003-3-1 2003-4-1 2003-5-1 2003-6-1 2003-7-1 2003-8-1 2003-9-1 2003-10-1 2003-11-1 2003-12-1 2004-1-1 2004-2-1 2004-3-1 2004-4-1 2004-5-1 2004-6-1 2004-7-1 2004-8-1 2004-9-1 2004-10-1 2004-11-1 2004-12-1 2005-1-1 2005-2-1 2005-3-1 2005-4-1 2005-5-1 2005-6-1 2005-7-1 2005-8-1 2005-9-1 2005-10-1 2005-11-1 2005-12-1 2006-1-1 2006-2-1 2006-3-1 2006-4-1 2006-5-1 2006-6-1 2006-7-1 2006-8-1 2006-9-1 2006-10-1 2006-11-1 2006-12-1 2007-1-1 2007-2-1 2007-3-1 2007-4-1 2007-5-1 2007-6-1 2007-7-1 2007-8-1 2007-9-1 2007-10-1 2007-11-1 2007-12-1 2008-1-1 2008-2-1 2008-3-1 2008-4-1 2008-5-1 2008-6-1 2008-7-1 2008-8-1 2008-9-1 2008-10-1 2008-11-1 2008-12-1 2009-1-1 2009-2-1 2009-3-1 2009-4-1 2009-5-1 2009-6-1 2009-7-1 2009-8-1 2009-9-1 2009-10-1 2009-11-1 2009-12-1 2010-1-1 2010-2-1 2010-3-1 2010-4-1 2010-5-1 2010-6-1 2010-7-1 2010-8-1 2010-9-1 2010-10-1 2010-11-1 2010-12-1 2011-1-1 2011-2-1 2011-3-1 2011-4-1 2011-5-1 2011-6-1 2011-7-1 2011-8-1 2011-9-1 2011-10-1 2011-11-1 2011-12-1 2012-1-1 2012-2-1 2012-3-1 2012-4-1 2012-5-1 2012-6-1 2012-7-1 2012-8-1 2012-9-1 2012-10-1 2012-11-1 2012-12-1 2013-1-1 2013-2-1 2013-3-1 2013-4-1 2013-5-1 2013-6-1 2013-7-1 2013-8-1 2013-9-1 2013-10-1 2013-11-1 2013-12-1 2014-1-1 2014-2-1 2014-3-1 2014-4-1 2014-5-1 2014-6-1 2014-7-1 2014-8-1 2014-9-1 2014-10-1 2014-11-1 2014-12-1 2015-1-1 2015-2-1 2015-3-1 2015-4-1 2015-5-1 2015-6-1 2015-7-1 2015-8-1 2015-9-1 2015-10-1 2015-11-1 2015-12-1 2016-1-1 2016-2-1 2016-3-1 2016-4-1 2016-5-1 2016-6-1 2016-7-1 2016-8-1 2016-9-1 2016-10-1 2016-11-1 2016-12-1 2017-1-1 2017-2-1 2017-3-1 2017-4-1 2017-5-1 2017-6-1 2017-7-1 2017-8-1 2017-9-1 2017-10-1 2017-11-1 2017-12-1 2018-1-1 2018-2-1 2018-3-1 2018-4-1 2018-5-1 2018-6-1 2018-7-1 2018-8-1 2018-9-1 2018-10-1 2018-11-1 2018-12-1 2019-1-1

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

David Hill
David Hill 2021-3-12

1 个投票

a=datetime(1981,1,1);
b=datetime(2019,1,31);%must be year,month,day
t1=a:calmonths(1):b;
t2=datetime(t1,'Format','yyyy-M-d');
M=datevec(t2);

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