Matlab中多个字符串的日期 [英] Date from multiple strings in Matlab

问题描述

我必须从两个字符串中生成一个日期(字符串或数字)，第一个是日期，第二个是时间.我一定在代码中犯了一些错误，因为结果与源数据的串联不同.

I have to generate one date (string or number) from two strings, the first of which is the day and the second the time. I must have made an error something in my code, because the result is different from the concatenation of the source data.

DIR4{h} = datestr(strcat(DIR1{h},' ',DIR2{h}),'dd/mm/yyyy HH:MM:SS');

但是:

DIR1{1} = 26/06/1998
DIR2{1} = 15:00:00

DIR4{1} = 17/03/0049 15:00:00

发生了什么事?

推荐答案

如果执行了每个中间步骤，您会发现strcat会忽略尾随空格(

If you'd executed every intermediate steps, you would have seen that strcat ignores trailing spaces (as documented):

strcat('26/06/1998',' ','15:00:00')

> 26/06/199815:00:00

修复非常简单:只是不使用strcat，而是使用纯矩阵级联:

The fix is rather easy: just don't use strcat, but rather use plain matrix concatenation:

strSrcDate = ['26/06/1998',' ','15:00:00']

接下来，您将使用错误的日期转换功能. datestr是要转换字符串，而不是源字符串.好的，它可以处理字符串输入，但这相当受限制 .您将要使用 datenum :

Next you're using the wrong date conversion function. datestr is to convert tó a string, not from. Ok ok, it can handle string input, but that's quite restricted. You'll want to use datenum:

这给出了一个日期序列号(请阅读文档！)，它是一个代表日期的数字(没有任何歧义).使用该编号来内部存储日期，并且要将日期打印到屏幕或文件中时，请使用datestr:

This gives a date serial (read the doc!), which is a number that represents a date (without any ambiguity). Use that number for internal storage of a date, and when you want to print that date out to screen or file, convert it to a string using datestr:

numSrcDate = datenum(strSrcDate,'dd/mm/yyyy HH:MM:SS')

> 729932.625

datestr(numSrcDate,'dd/mm/yyyy HH:MM:SS'); % or any other format
datestr(numSrcDate,'dd/mm/yy HH:MM');

> 26/06/1998 15:00:00
> 26/06/98 15:00

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