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# RTClib [](https://github.com/adafruit/RTClib/actions)[](http://adafruit.github.io/RTClib/html/index.html)
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This is a fork of JeeLab's fantastic real time clock library for Arduino.
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Works great with Adafruit RTC breakouts:
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- [DS3231 Precision RTC](https://www.adafruit.com/product/3013) (breakout) and [Stemma QT version](https://www.adafruit.com/product/5188)
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- [PCF8523 RTC](https://www.adafruit.com/product/3295)
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- [DS1307 RTC](https://www.adafruit.com/product/3296)
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Please note that dayOfTheWeek() ranges from 0 to 6 inclusive with 0 being 'Sunday'.
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<!-- START COMPATIBILITY TABLE -->
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## Compatibility
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MCU | Tested Works | Doesn't Work | Not Tested | Notes
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------------------ | :----------: | :----------: | :---------: | -----
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Atmega328 @ 16MHz | X | | |
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Atmega328 @ 12MHz | X | | |
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Atmega32u4 @ 16MHz | X | | | Use SDA/SCL on pins D3 & D2
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Atmega32u4 @ 8MHz | X | | | Use SDA/SCL on pins D3 & D2
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ESP8266 | X | | | SDA/SCL default to pins 4 & 5 but any two pins can be assigned as SDA/SCL using Wire.begin(SDA,SCL)
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Atmega2560 @ 16MHz | X | | | Use SDA/SCL on Pins 20 & 21
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ATSAM3X8E | X | | | Use SDA1 and SCL1
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ATSAM21D | X | | |
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ATtiny85 @ 16MHz | X | | |
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ATtiny85 @ 8MHz | X | | |
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Intel Curie @ 32MHz | | | X |
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STM32F2 | | | X |
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* ATmega328 @ 16MHz : Arduino UNO, Adafruit Pro Trinket 5V, Adafruit Metro 328, Adafruit Metro Mini
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* ATmega328 @ 12MHz : Adafruit Pro Trinket 3V
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* ATmega32u4 @ 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2.0
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* ATmega32u4 @ 8MHz : Adafruit Flora, Bluefruit Micro
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* ESP8266 : Adafruit Huzzah
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* ATmega2560 @ 16MHz : Arduino Mega
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* ATSAM3X8E : Arduino Due
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* ATSAM21D : Arduino Zero, M0 Pro
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* ATtiny85 @ 16MHz : Adafruit Trinket 5V
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* ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V
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<!-- END COMPATIBILITY TABLE -->
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Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
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# Dependencies
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* [Adafruit BusIO](https://github.com/adafruit/Adafruit_BusIO)
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# Contributing
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Contributions are welcome! Please read our [Code of Conduct](https://github.com/adafruit/RTClib/blob/master/code-of-conduct.md)
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before contributing to help this project stay welcoming.
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## Documentation and doxygen
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For the detailed API documentation, see https://adafruit.github.io/RTClib/html/index.html
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Documentation is produced by doxygen. Contributions should include documentation for any new code added.
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Some examples of how to use doxygen can be found in these guide pages:
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https://learn.adafruit.com/the-well-automated-arduino-library/doxygen
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https://learn.adafruit.com/the-well-automated-arduino-library/doxygen-tips
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## Code formatting and clang-format
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The code should be formatted according to the [LLVM Coding Standards](https://llvm.org/docs/CodingStandards.html), which is the default of the clang-format tool. The easiest way to ensure conformance is to [install clang-format](https://llvm.org/builds/) and run
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```shell
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clang-format -i <source_file>
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```
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See [Formatting with clang-format](https://learn.adafruit.com/the-well-automated-arduino-library/formatting-with-clang-format) for details.
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Written by JeeLabs
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MIT license, check license.txt for more information
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All text above must be included in any redistribution
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To install, use the Arduino Library Manager and search for "RTClib" and install the library.
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