ESP32 Forum

Posted: **Fri May 22, 2020 10:21 am**

On my ESP32 I want to have information about actual time without Wifi connection or an external RTC chip. I started with this simple code

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time_t now;
struct tm* timeinfo;

void Check_Time(void) {
  time(&now);
  timeinfo = localtime(&now);
  Serial.println(timeinfo);
}

void setup() {
  Serial.begin(115200);
}

void loop() {
  Check_Time();
  delay(1000);
}

It works since the output is

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Thu Jan  1 00:07:57 1970
Thu Jan  1 00:07:58 1970
Thu Jan  1 00:07:59 1970
Thu Jan  1 00:08:00 1970
...

and naturally it starts from 1 Jan 1970. Now I want to update this time to the actual one but I haven't found a direct solution. I know that I could convert a date to a

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time_t

data with the

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mktime

function (is it right?) but how I can pass it to the system? How I should manage this problem?

Posted: **Fri May 22, 2020 1:12 pm**

https://github.com/espressif/esp-idf/tr ... em/console

If you want to use only internal RTC you have to remember it has a huge drift.

Posted: **Fri May 22, 2020 3:17 pm**

https://github.com/lbernstone/ESP32_settimeofday

ESP32 Forum

How set epoch on ESP32 and Arduino IDE to update the timedate without external RTC and Wifi?

How set epoch on ESP32 and Arduino IDE to update the timedate without external RTC and Wifi?

Re: How set epoch on ESP32 and Arduino IDE to update the timedate without external RTC and Wifi?

Re: How set epoch on ESP32 and Arduino IDE to update the timedate without external RTC and Wifi?