Two date structures "sharing" the same date
Hi
I'm a new C++ programmer (although I've done BV et al for years) so I may be missing something obvious here, but what is wrong with this?
I have two date/time structures which I'm populating, but when I populate the second one it sets the same values in the first.
This is what I've got so far
tm *FirstDate = gmtime(&now);
tm *SecondDate = gmtime(&now);
cout <<"Enter your first date in the format dd/mm/yyyy" << endl <<">";
getline (cin,tempstring);
FirstDate->tm_mday = atoi(tempstring.substr(0,2).c_str());
FirstDate->tm_mon = atoi(tempstring.substr(3,2).c_str());
FirstDate->tm_year = atoi(tempstring.substr(6,4).c_str());
// this is correct...
cout<<" your first entered " <<FirstDate->tm_mday << "/" <<FirstDate->tm_mon <<"/" <<FirstDate->tm_year <<endl;
cout <<"Now enter your second date in the format dd/mm/yyyy" << endl <<">";
getline (cin,tempstring2);
SecondDate->tm_mday = atoi(tempstring2.substr(0,2).c_str());
SecondDate->tm_mon = atoi(tempstring2.substr(3,2).c_str());
SecondDate->tm_year = atoi(tempstring2.substr(6,4).c_str());
// at this point they're both the same as the last entry..
cout<<" your first entered " <<FirstDate->tm_mday << "/" <<FirstDate->tm_mon <<"/" <<FirstDate->tm_year <<endl;
cout<<" your second entered " <<SecondDate->tm_mday << "/" <<SecondDate->tm_mon <<"/" <<SecondDate->tm_year <<endl;
What have I missed or misunderstood?
Cheers
Sam
Re: Two date structures "sharing" the same date
When posting code, please format your code and use code tags. Go Advanced, select the code and click '#'.
Quote:
What have I missed or misunderstood?
From MSDN http://msdn.microsoft.com/en-us/libr...=vs.60%29.aspx
The gmtime, mktime, and localtime functions use the same single, statically allocated structure to hold their results. Each call to one of these functions destroys the result of any previous call. If timer represents a date before midnight, January 1, 1970, gmtime returns NULL. There is no error return.
Re: Two date structures "sharing" the same date
Ahh, thanks 2kaud,
Still got the VB mindset where you can do this sort of thing. I'll try another approach.
Sorry about the code insert. I'll know next time
Sam