Arduino:
Перетворення дати в рядок

Що і Чому?

Date to string conversion means transforming a date (like year, month, day) into a text format. Programmers do this to display dates on screens, log events, or format data for storage.

How to:

Як це зробити:

Arduino doesn’t have a built-in date type, but you can use libraries like RTClib for real-time clocks or TimeLib for time functions. Here’s how you do it with TimeLib:

#include <TimeLib.h>

void setup() {
  Serial.begin(9600);
  setTime(23, 59, 30, 12, 31, 2020); // Set the time to December 31, 2020, 23:59:30
}

void loop() {
  char buffer[20];
  sprintf(buffer, "%02d/%02d/%04d %02d:%02d:%02d", day(), month(), year(), hour(), minute(), second());
  Serial.println(buffer); // Outputs "31/12/2020 23:59:30"
  delay(1000); // Wait for a second
}

Sample output:

31/12/2020 23:59:30

Deep Dive

Детальніше

Originally, Arduino lacked time and date handling until libraries like TimeLib filled the gap. Alternatives like RTClib interface directly with real-time clock hardware. For converting date to string, sprintf is your go-to in C++, which Arduino uses. It formats data into a buffer. Careful with buffer sizes—they must be large enough to hold your string, including the terminating null character \0.

See Also

Дивіться також

• Arduino TimeLib library: https://github.com/PaulStoffregen/Time
• Arduino RTClib library by Adafruit: https://github.com/adafruit/RTClib
• sprintf reference: http://www.cplusplus.com/reference/cstdio/sprintf/