C ++中的日期/时间解析 [英] Date/Time parsing in C++

问题描述

在c ++中进行数据/时间解析（将任何格式的字符串转换为日期）时，我发现以下有用的方法

While doing the data/time parsing in c++ (converting a string in any format to a date), i found the following useful methods

1）strptime - 这里％d，％m等可以有1或2个字符。该功能会处理。这样做的结果是，我们在两个转换说明符之间使用一个分隔符。例如：它不能给出％d％m，它是％d /％m或任何其他分隔符。此外，这不支持时区。

1) strptime() - here the %d, %m etc can have either 1 or 2 characters. The function will take care of that. As a result of this it will enforce that we use a separator between two conversion specifiers. Ex: Its not valid to give %d%m it has be to %d/%m or any other separator. Also this does not support timezones.

2）提升日期IO - 这里％d，％m必须有2个字符。现在，我得到的输入字符串不能保证有这个。因此，它不可能成功地使用这个。但是，这似乎支持时区，但不确定。因为它表示输入它支持时区

2) Boost date IO - here the %d, %m has to have 2 characters. Now, the input string i get is not guaranteed to have this. As a result, its not possible to use this successfully. However, this does seem to support timezone, but not sure. because it says for inputs it does support timezone

所以我打算同时使用两者来确定日期。但我想得到一个，我可以考虑到时区，以及。但没有人似乎支持这一点。

So i am planning to use both in conjunction to determine the date. But i would like to get one where i can take into account the timezone as well. But none seems to be supporting that.

有人有建议吗？
Rgds，
AJ

Does anybody have a suggestion? Rgds, AJ

推荐答案

@AJ：添加了另一个答案， >

@AJ: Added another answer so the code gets formatted

#include <stdio.h>
#include <sys/time.h>
#include <time.h>

int
main(void)
{
        struct tm tm[1] = {{0}};

        strptime("Tue, 19 Feb 2008 20:47:53 +0530", "%a, %d %b %Y %H:%M:%S %z", tm);
        fprintf(stdout, "off %ld\n", tm->tm_gmtoff);
        return 0;
}

运行看起来像（glibc 2.10.1）：

And a run looks like (glibc 2.10.1):

freundt@clyde:pts/28:~/temp> ./test
off 19800

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