C++ LANGUAGE FORMAT TIME USING STRUCT TM

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C++ LANGUAGE FORMAT TIME USING STRUCT TM

Format Time using struct tm 


The tm structure is very important while working with date 
and time in either C or C++. This structure holds the date 
and time in the form of a C structure as mentioned above. 
Most of the time related functions makes use of tm structure. 
Following is an example which makes use of various date and 
time related functions and tm structure: 

While using structure in this chapter, I'm making an assumption 
that you have basic understanding on C structure and how to 
access structure members using arrow -> operator. 

 
#include <iostream> 
#include <ctime> 
 
using namespace std; 
 
int main( ) 
{ 
   // current date/time based on current system 
   time_t now = time(0); 
 
   cout << "Number of sec since January 1,1970:" << now << endl; 
 
   tm *ltm = localtime(&now); 
 
   // print various components of tm structure. 
   cout << "Year: "<< 1900 + ltm->tm_year << endl; 
   cout << "Month: "<< 1 + ltm->tm_mon<< endl; 
   cout << "Day: "<<  ltm->tm_mday << endl; 
   cout << "Time: "<< 1 + ltm->tm_hour << ":"; 
   cout << 1 + ltm->tm_min << ":"; 
   cout << 1 + ltm->tm_sec << endl; 
} 
When the above code is compiled and executed, 
it produces the following result: 

Number of sec since January 1, 1970:1294548238 
Year: 2011 
Month: 1 
Day: 8 
Time: 22: 44:59