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。