Converting a Labview time into a string with Measurement Studio C++

Question

In my Measurement Studio-based C++ application, I'll be sent a Labview
time in the format of a double, which I believe is seconds since 1904.
Does Measurement Studio for Visual C++ contain a function that will
convert that time value into a string format? I'd like to end up with
something like "hh:mm:ss:msec". I'm basically looking for the
equivalent of the Labview vi, "Format Time/Date String". If Measurement
Studio doesn't provide this, is there some other (hopefully simple) way
to do this?
I can request that the Labview application send me time in a string
format as well as a double; this will require several changes to the
Labview application sending the timestamp, but if that is a simpler
solution that's the option we'll take.
Thanks in advance,
Adam

Answer 1

Measurement Studio does not have a function for this, but you can do
this yourself by first converting from LV epoch (1/1/1904) to Unix
epoch(1/1/1970) and then using c runtime time functions
UNIXEpochOffset is the difference between the 2 epochs at GMT. To
convert to a UNIX system clock value, just subtract the sum of this
number and your time zone offset in seconds
lvTime is the value returned by LV timestamp
#define  UNIXEpochOffset 2082844800
int _tmain(int argc, _TCHAR* argv[])
    __int64 lvTime = 3214396284; //10:48:13.173 AM 11/9/2005
    //GMT offset for Central Time is -6 (3600 seconds). You will need to account for daylight savings time.
    int offset = -3600;
    time_t unixTime = lvTime - UNIXEpochOffset - offset;  
    struct tm *newtime = localtime(&unixTime);
    printf(asctime( newtime )); //prints out the time in a string format.
    return 0;
Bilal Durrani
NI