Timestamp in milliseconds

Projects Programming
1

How do you get the timestamp in milliseconds for #include "time.h"?

The way I do it it fees a bit hacky.


#include "time.h"

int64_t timestamp;
int64_t test;


const char* ntpServer = "pool.ntp.org";


unsigned long getTime() {
  time_t now;
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    return(0);
  }
  time(&now);
  return now;
}


void setup(){
  Serial.begin(115200);
 configTime(0, 0, ntpServer);

}

void loop(){
    //Get current timestamp
    timestamp = getTime();
    Serial.print ("time: ");
    Serial.println (timestamp);
    test = timestamp * 1000;
    Serial.print ("test: ");
    Serial.println (test);
}
2

What microcontroller?
Why do you specify getTime to be a unsigned long but you return the value of now which is of type time_t?

see time_t here:

https://en.cppreference.com/w/c/chrono/time_t

value holding the number of seconds

so yes, multiplied by 1000 will give you some kind of "microseconds"

3

ESP32

4

may be you want to check if this can be reused under the Arduino Framework:

5

Looks like the same hacky way of *1000, thanks

6

not really, there is a link and a code snippet how to use ยตsec * 1000 ... which might give you milliseconds...

7

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