IOT post datetime to cloud

Using Arduino Programming Questions
#1

Am I the only person on the planet that wants to convert a datetime to string or char array?

I have searched for examples.

I want to convert the current datetime to a string or char array.

string dt = DateTime().tostring();

I need a string like this:
yyyy.mm.dd.hh.mm.ss

2014.10.22.17.25.30

With our without the periods.

Can someone help on this simple request?

Thank you.

#2

https://www.google.com/search?q=localTime+sprintf+site%3Aforum.arduino.cc

Second hit...

Change to suit...

////////////////////////////////////////////////////////
//
// PrintTime
//
// Serial Print time (DD/MM/YYYY - HH:MM:SS)
//
void PrintTime() {
  char cTime[22];
  
    sprintf(cTime, "%02u/%02u/%4u - %02u:%02u:%02u", day(), month(), year(), hour(), minute(), second());
    Serial.println(cTime);
}
#3

Thank you so much for your reply. I can move on in my project.

#4

Coding B.
i am a c# programmer and am just staring out with Arduino. I wonder if you could help me with this next step.

I need to incorporate the datetime string that you helped me with into my json object that I am sending up to Azure.
I have the time and need to assign it to the activitytime value, but i am mixing a char with a string and that is not allowed.

char cTime[22];

sprintf(cTime, "%04s/%02s/%2s:%02s:%02s:%02s", year(), month(), day(), hour(), minute(), second());

sprintf(buffer, "{"location":"26 Oak", "activitytime":"" + cTime + ""}");

Thank you.

#5 
char cTime[22];

sprintf(cTime, "%04s/%02s/%2s:%02s:%02s:%02s", year(), month(), day(), hour(), minute(), second());

sprintf(buffer, "{\"location\":\"26 Oak\", \"activitytime\":\"%s\"}", cTime);
#6

Or...

sprintf(
    buffer, 
    "{\"location\":\"26 Oak\", \"activitytime\":\"%04s/%02s/%2s:%02s:%02s:%02s\"}", 
    year(), month(), day(), hour(), minute(), second() );
#7

Thank you very much for your help.

Terrence

#8

You are welcome.

#9

Coding B, I have been messing with this time conversion all week. I figured I could figure it out with your previous help, but I am stuck.

The code you posted causes an error and I have no idea how to debug it.

Here is the error.
B0100000063f694
this happens on this line of the sketch: sprintf(cTime, "%0

Here is the sketch

#include <Time.h>
char buffer[64];

void setup() {

Serial.begin(9600);
char cTime[22];
sprintf(cTime, “%04s/%02s/%2s:%02s:%02s:%02s”, year(), month(), day(), hour(), minute(), second());
sprintf(buffer, “{“location”:“26 Oak”, “activitytime”:”%s"}", cTime);
}

void loop(){
}

#10

I figured it out. It's d not s

sprintf(cTime, "%04d.%02d.%02d.%02d:%02d:%02d", year(), month(), day(), hour(), minute(), second());

Thanks for your help.
Terrence

#11

Well spotted.

#12