C asctime() function

Last update on December 20 2022 13:28:39 (UTC/GMT +8 hours)

C asctime() function - Convert date and time to a string

Syntax:

char *asctime(const struct tm *timeptr)

The asctime() function is used to convert time, stored as a structure pointed to by time, to a character string.

The fields of the tm structure include:

tm_sec	Seconds (0-61)
tm_min	Minutes (0-59)
tm_hour	Hours (0-23)
tm_mday	Day of month (1-31)
tm_mon	Month (0-11; January = 0)
tm_year	Year (current year minus 1900)
tm_wday	Day of week (0-6; Sunday = 0)
tm_yday	Day of year (0-365; January 1 = 0)
tm_isdst	Zero if daylight saving time is not in effect; positive if daylight saving time is in effect; negative if the information is not available.

Parameters:

Name	Description	Required /Optional
timeptr	Time/date structure.	Required

Return value from asctime()

Upon successful completion, asctime() shall return a pointer to the string.
If the function is unsuccessful, it shall return NULL.

Example: asctime() function

#include <time.h>
#include <stdio.h>
 
int main(void)
{
    struct tm *new_time;
    time_t lctime;
 
   // Get the time in seconds
    time(&lctime);
   // Convert it to the structure tm
    new_time = localtime(&lctime);
 
  // Print the local time as a string
    printf("The current date and time are: %s", asctime(new_time));
}

Output:

The current date and time are: Mon Dec 19 21:32:36 2022

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