mbed_example / Mbed OS time_HelloWorld

time Hello World

Fork of time_HelloWorld by Mbed

Use

The time interface is used to access the Real Time Clock (RTC). The time is set as an offset measured in seconds from the time epoch, which is library specific. In general the accepted time epoch is the Unix Epoch. An online converter between human readable time and Unix Epoch time is handy, try this one. If the system is not battery powered then on each reset the rtc time will be reset. Make sure to either provide battery power to keep the time or to reset it each time the device is run.

API

There is no official time API, instead you use the functions in the example code.

main.cpp@0:b3b93997a0a6, 2013-02-13 (annotated)

Committer:
mbed_official
Date:
Wed Feb 13 17:07:52 2013 +0000
Revision:
0:b3b93997a0a6
Child:
2:c8b4159048f0
time Hello World

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:b3b93997a0a6 1 #include "mbed.h"
mbed_official 0:b3b93997a0a6 2
mbed_official 0:b3b93997a0a6 3 int main() {
mbed_official 0:b3b93997a0a6 4 set_time(1256729737); // Set RTC time to Wed, 28 Oct 2009 11:35:37
mbed_official 0:b3b93997a0a6 5
mbed_official 0:b3b93997a0a6 6 while (true) {
mbed_official 0:b3b93997a0a6 7 time_t seconds = time(NULL);
mbed_official 0:b3b93997a0a6 8
mbed_official 0:b3b93997a0a6 9 printf("Time as seconds since January 1, 1970 = %d\n", seconds);
mbed_official 0:b3b93997a0a6 10
mbed_official 0:b3b93997a0a6 11 printf("Time as a basic string = %s", ctime(&seconds));
mbed_official 0:b3b93997a0a6 12
mbed_official 0:b3b93997a0a6 13 char buffer[32];
mbed_official 0:b3b93997a0a6 14 strftime(buffer, 32, "%I:%M %p\n", localtime(&seconds));
mbed_official 0:b3b93997a0a6 15 printf("Time as a custom formatted string = %s", buffer);
mbed_official 0:b3b93997a0a6 16
mbed_official 0:b3b93997a0a6 17 wait(1);
mbed_official 0:b3b93997a0a6 18 }
mbed_official 0:b3b93997a0a6 19 }