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

Committer:
Przemyslaw Stekiel
Date:
9 months ago
Revision:
5:0c6401d671c6
Parent:
2:c8b4159048f0

File content as of revision 5:0c6401d671c6:

/* mbed Example Program
 * Copyright (c) 2006-2014 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "mbed.h"

int main() {
    set_time(1256729737);  // Set RTC time to Wed, 28 Oct 2009 11:35:37

    while (true) {
        time_t seconds = time(NULL);
        
        printf("Time as seconds since January 1, 1970 = %u\n", (unsigned int)seconds);
        
        printf("Time as a basic string = %s", ctime(&seconds));

        char buffer[32];
        strftime(buffer, 32, "%I:%M %p\n", localtime(&seconds));
        printf("Time as a custom formatted string = %s", buffer);
        
        wait(1);
    }
}