Save local time in a variable

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Save local time in a variable

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#1 by (1 votes)

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I am trying to save the time of registration in a variable, for example, if the system registers a program execution at 3am I need to save it in a variable, but if I print the value of that variable at any other time, I always show me 3am

int *tiempo;
time_t currentTime = time(NULL);
time(&currentTime);
struct tm *myTime = localtime(&currentTime);
tiempo = myTime->tm_sec;
printf("Tiempo en segundos actual: %d\n", myTime->tm_sec);
printf("Tiempo registrado: %d\n", tiempo);

.

c datetime

asked by Arath Jimenez 29.11.2017 в 01:19

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1 answer

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score 1 · Accepted Answer

tiempo = myTime->tm_sec;

With that line you are only storing the seconds. If your idea is to store the full time, you also need to save the time and minutes:

tiempo = myTime->tm_hour * 3600 + myTime->tm_min * 60 + myTime->tm_sec;

Now, since in tiempo you are storing the encoded date in seconds it does not make much sense to print the value in the raw:

printf("Tiempo registrado: %d\n", tiempo);

Since you are going to return a value expressed only in seconds. Instead you would have to treat the variable before printing it:

int segundos = tiempo % 60;
tiempo /= 60;
int minutos = tiempo % 60;
int horas = tiempo / 60;

printf("Tiempo registrado: %02d:%02d:%02d\n", horas, minutos, segundos);

To simplify the task, it would be advisable to work with a variable of type time_t or struct tm . The reason is that there are functions that allow you to print and treat hours easily. For example, to print the full time you can do the following:

struct tm tiempo = localtime(time(NULL));
char buffer[50];
strftime (buffer,50,"%H:%M:%S",tiempo);

printf("Tiempo registrado: %d\n", buffer);

Or even, if your idea is to come out of am or pm you can do this:

struct tm tiempo = localtime(time(NULL));
char buffer[50];
strftime (buffer,50,"%I:%M:%S %p",tiempo);

printf("Tiempo registrado: %d\n", buffer);

Thus the time will be printed in 12 hours format and indicating if it is in the morning or in the afternoon ... and all without touching the code.