MATLAB Fundamentals＞＞＞Creating Datetimes
Creating datetime Arrays
提示1：If you want to specify the time, use the optional fourth through sixth input arguments in the datetime function. They represent the hour, minute, and second in that order.
t = datetime(2014,5,25,8,11,0) t = 25-May-2014 08:11:00 Note that there are either three or six input values for datetime.)
任务1：
Use numeric inputs to create a datetime named d with a value of “February 29th, 2016 17:00”.
解答：
d = datetime(2016,2,29,17,0,0)提示2：To create vectors and matrices of type datetime you can specify array inputs to the datetime function. Notice that providing a row vector as input produces a row vector, and a column vector as input produces a column vector.
任务2：
Create a 3-by-1 column vector named d2 of type datetime as shown below.
01-Feb-1999 01-Feb-2000 01-Feb-2001
解答：
d2 = datetime([1999;2000;2001],2,1)任务3：
Create a 1-by-4 row vector named d3 of type datetime representing the dates January 1st-4th, 1975.
解答：
d3 = datetime(1975,1,1:4)任务4：
Create a 12-by-1 vector d4 of type datetime containing the first day of each month in the year 1990.
解答：
d4 = datetime(1990,1:12,1)'笔记：
（1）创建时间参数最多6个，年-月-日-时-分-秒；
（2）若要创建 datetime 类型的向量和矩阵，可以指定 datetime 函数的数组输入。请注意，提供行向量作为输入会生成行向量，而作为输入的列向量会生成列向量；
（3）提供列向量的形式可为单个变量写成列向量，例如d2 = datetime([1999;2000;2001],2,1)，也可以整体转换为向量，如d4 = datetime(1990,1:12,1)'与d4 = datetime(1990,(1:12)',1)）结果是一样的。