Get current date and time in C++

Question

I have tried multiple ways to get date and time with ctype and localtime but I get error that The variable or function maybe unsafe and I thingk it is there for a reason.

Can anybody please tell me a valid way to get current date and time in C++ in Visual Studio 2019?

thankyou in advance!

Answer 1

Hi,

I suggest you could try the following code:

#include<iostream>  
#include <stdio.h>        
#include <time.h>     
using namespace std;  
int main() {  
	time_t timetoday;  
	time(&timetoday);  
	cout << "Calendar date and time as per todays is : " << asctime(localtime(&timetoday));  
	return 0;  
}  

I get error that The variable or function maybe unsafe and I thingk it is there for a reason.

According to your description, is the error you encountered is "C4996"? I suggest you could try to add the following code:

#pragma warning(disable : 4996)  

For more details I suggest you could refer to the Doc:

And you could also try to use asctime_s and localtime_s:

#include <time.h>  
#include <stdio.h>  
  
struct tm newtime;  
__time32_t aclock;  
  
int main( void )  
{  
   char buffer[32];  
   errno_t errNum;  
   _time32( &aclock );   
   _localtime32_s( &newtime, &aclock );   
   errNum = asctime_s(buffer, 32, &newtime);  
     
   printf( "Current date and time: %s", buffer );  
   return 0;  
}  

Best Regards,

Jeanine

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Answer 2

For localtime, the cause of the message is right in the documentation - localtime-localtime32-localtime64
It says "More secure versions of these functions are available; see localtime_s, _localtime32_s, _localtime64_s."

Answer 3

Look at this example :-
https://pastebin.com/8RvKStiv