Re: time_t problem
On Wed, 7 Jun 2006 18:33:48 +0800, "Tan" <tan@tiss-msc.com> wrote:
Hi,
I having a problem to convert time_t to DateTime in .Net.
Eg.
In C++, I used the following method:
time_t a 1149719862L;
CTime timeTemp = a;
timeTemp.Format(_T("%Y-%m-%d %I:%M:%S %p"))
Result:
2006-06-07 03:37:42 PM
In .Net,
long time_t = 1149719862L;
long win32FileTime = 10000000*time_t + 116444736000000000;
DateTime dt = DateTime.FromFileTime(win32FileTime);
String.Format("{0:dd/MM/yyyy hh:mm:ss tt}", dt);
Result:
08/06/2006 06:37:42 AM
May I know why the above convertion is wrong? Please guide me on how to
convert time_t to DateTime.
Thank you in advance.
Looks like a time zone difference. You always need to check the docs to
determine whether or not the functions you're using take or return local
time or UTC. Some other comments:
1. time_t is a type, so don't use it as a variable name.
2. It's more portable and reliable to get a time_t from a function that
takes a broken-down time, like mktime.
3. You can convert a SYSTEMTIME to FILETIME with SystemTimeToFileTime,
which would allow you to bypass time_t and the Standard C time functions.
--
Doug Harrison
Visual C++ MVP
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