[RESOLVED] Milliseconds using ColeDateTime

[Learned]

According to MSDN, ColeDateTime has resolution of 1 millisecond but when I try to use add 0.002 seconds to a ColeDateTime object and try to output the seconds using GetSecond(), I still get an integer of seconds.

Can I print the milliseconds instead?

I did do some google search but couldn't find a definite answer. My problem is I have two times given tstart 11:13:26.001 (11am, 13 min, 26 second, 1 milliseconds) and tend in format like 11:17:13.001. I want to get times every 0.002 seconds between tstart and tend.

Thanks

[Learned]

Is this problem that hard that there have been more than 50 views and still no could answer it.

[Philip Nicoletti]

1. GetSecond() returns the integer second between 0 and 59 ... it
has nothing to do with millisec.

2) you mentioned that you added 0.002 milliseconds. How did you
do that ? If you add 0.002 to a COleDateTime object, that
is the same as adding 172.8 seconds. ( adding 1.0 = 24 hours , not
1 second).

3) It is not clear why you are using COleDateTime for this (at
least not to me).

4) you can use the m_dt data member to get the date/time (the fractional
part is the time ... as a fraction of 24 hours. So if the fractional part
is 0.5, that is 12 hours).

[ovidiucucu]

Beside what Philip Nicoletti already stated.

Indeed, MSDN notes that COleDateTime keeps the time with an approximate resolution of 1 millisecond (better said, its underlying DATE member can do that).
MSDN: Date and Time: Automation Support
However (keeping an eye on "approximate" word above) the COleDateTime is designed to work with a resolution of 1 second.
Probably, if someone tries to extend it for dealing with a higher resolution will get (floating point) calculation errors.
Anyhow, there is not a good ideea to directly modify COleDateTime::m_dt.

So,

1. Use COleDateTime for a maximum resolution of 1 second.
2. Do not directly modify COleDateTime::m_dt; instead, call COleDateTime methods or use COleDateTimeSpan to add relative time.

If you need resolution of 1 millisecond, then write your own classes keeping, for example, a SYSTEMTIME structure.
It's a little bit to sweat but, that's it!

[Learned]

I do not have to use ColeDateTime but that is the only thing I came across with a working example. So, I implemented in my code.

So, is there any example code for m_dt which plays with milliseconds. I am looking for a very simple example like sets some time in milliseconds, adds another milliseconds to it and then gets hour, minute, second, milliseconds from new time.

Also while using ColeDateTime when I add 0.02 second ofcourse myseconds do not change.

Thanks

[Learned]

I think this is the solution since I can't use Boost:

http://www.codeproject.com/KB/datetime/hightime.aspx

But would love to hear your opinion about the above if you have any.

[Learned]

The CHightime gives build erros with Visual Studio 2010 and I am not the only one having it.

[Learned]

Ok if I try to use the prvious suggestion about SYSTEM time to write my own code, how do I do it.

I want to give in a specified time and be able to add 0.002 milliseconds and get new time. But using SYSTEM time I do not see any constructor where I can specify my supplied time.

Any hint is appreciated.

[VladimirF]

The CHightime gives build erros with Visual Studio 2010 and I am not the only one having it.

What build errors?
Could you please post your test project that failed to build here?

[Learned]

I wrote my own millisecond handler which still uses ColeDateTime but the kind of errors I was getting are:
xxx needs ';' before xxx, etc and the errors were in files which I downloaded from code project website. And there were tonnes of such error.

I will just consider this thread as resolved since I am not prusuing this path anymore.

[Azeem.tp]

What build errors?
Could you please post your test project that failed to build here?

Hi
I have similar compilation errors.
Can anyone help if I post the errors here?

[VictorN]

Hi
I have similar compilation errors.
Can anyone help if I post the errors here?

Just post it and we will try to help...