两个日期之间的秒数差异? [英] Difference in seconds between two dates?
问题描述
问题很简单,其他语言中有许多特定于 API 的方法,但我发现没有一个对于跨平台 C++ 使用来说是简单直接的.
The question is simple, there are many API specific methods in other languages, but I found none that that were simple and straight forward for Cross-platform C++ usage.
如果我有两个日期,并且假定它们在同一语言环境中,那么在 C++ 中区分它们的最简单方法是什么?
If I have two dates, and they are assumed to be in the same locale, what is the easiest way to differentiate them in C++?
我(有点)研究过使用 time.h
,创建两个 tm
对象,将它们转换为 UTC,然后区分它们.
I have (somewhat) looked at using time.h
, creating two tm
objects, converting them to UTC and then differentiating them.
日期的当前格式为:YY/MM/DD HH:mm:SS
(存储为单个整数)
The current format for the dates is: YY/MM/DD HH:mm:SS
(stored as individual integers)
好的,根据当前的答案,我已经完成了以下操作(目前):
Ok, based on current answers, I've done the following (for now):
time_t calculate_seconds_between(
const uint Y1, const uint M1, const uint D1, const uint H1, const uint m1, const uint S1, // YY/MM/DD HH:mm:SS
const uint Y2, const uint M2, const uint D2, const uint H2, const uint m2, const uint S2
)
{
time_t raw;
time(&raw);
struct tm t1 = *gmtime(&raw), t2 = t1;
t1.tm_year = Y1 - 1900;
t1.tm_mon = M1 - 1;
t1.tm_mday = D1;
t1.tm_hour = H1;
t1.tm_min = m1;
t1.tm_sec = S1;
t2.tm_year = Y2 - 1900;
t2.tm_mon = M2 - 1;
t2.tm_mday = D2;
t2.tm_hour = H2;
t2.tm_min = m2;
t2.tm_sec = S2;
time_t tt1, tt2;
tt1 = mktime(&t1);
tt2 = mktime(&t2);
return (tt2 - tt1);
}
哪个效果很好.
推荐答案
要将 YY/MM/DD HH:mm:SS
转换为 struct tm
可以使用strptime(如果没有,请制作一个等价物)
To convert from YY/MM/DD HH:mm:SS
to struct tm
you can use strptime (or make an equivalent if you don't have it)
const char * dateInput;
// ....
struct tm tm;
time_t val;
memset(&tm, 0, sizeof(struct tm));
strptime(dateInput,"%y/%m/%d %H:%M:%S",&tm);
val = mktime(&tm);
获得两个 time_t
值后,您可以调用 difftime一>.
After you have the two time_t
values you can call difftime.
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