From HH:MM to seconde past midnight

Using Arduino Programming Questions
1

Hello,

I am getting moon rise and moon set from a http client in this format : HH:MM

For my project I will need to change this time in second past midnight.

Do you have any suggestion ?

Thanks,
Théo

2

Do you have any suggestion ?

I assume that if you got HH and MM as integers then you could calculate the number of seconds. Is the conversion where you are stuck ?

3

Thanks for your quick response

I can obviously do it by hand but I basically don t know how to write the code to get there..

Let say that I am learning coding micro-controller in unusual way.. Means that when it goes to basic I am lost and don t know which way to look to find simple example.

Leter on in my code I will have to convert from unix timestamp to YYYYMMDD. I made some research and i guess I will have to use GitHub - PaulStoffregen/Time: Time library for Arduino

Thanks for your help.

4

Let's start with the basics.

Do you have HH and MM as separate variables in your program and if so, what sort of variables are they ?

It would help if you posted your program but before you do please read this before posting a programming question and follow the advice about formatting code and using code tags when you post it

5

HH:MM are separate constant in my program (const char*).

Attached my program so far (made for ESP 8266).
In block comment where I expect to convert the time format.

Thanks,
Théo

IML_V7_forum.ino (2.25 KB)

6 
const char* moonRise = "05:23";
const char* moonSet = "17:11";

int32_t secondsFromHoursMinutes(const char* from) {
  return (atoi(from) * 60L + atoi(from + 3)) * 60;
}

void setup() {
  Serial.begin(250000);
  int32_t dsRise = secondsFromHoursMinutes(moonRise);
  int32_t dsSet = secondsFromHoursMinutes(moonSet);
  Serial.println(dsRise);
  Serial.println(dsSet);
  if (dsSet < dsRise) {
    dsSet += 24 * 60 * 60L;
  }
  int32_t dsDuration = dsSet - dsRise;
  Serial.print("duration ");
  Serial.print(dsDuration);
  Serial.println(" seconds");
}
void loop() {}

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7

I basically don t know how to write the code to get there.

The Arduino is programmed in C/C++. There are many fine on line tutorials and books to show you how.

8

Perfect !
Thanks Whandall !

Théo