Very usefull functions for adjusting your RTC to daylight saving time.
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Two Arduino Source Code files are provided.
The first contains the functions for DST adjustment for your RTC. In the main body, a demo program is provided to show the working of these functions.
The second also contains a drift correction for a RTC. When the software is compiled again and uploaded to the Arduino, the drift between the current and previous upload is calculated. Than the clock is adjusted to the PC date/time and the RTC is weekly corrected for the average measured drift.
My Clock procedures.inoBoth the DST + drift correction prceduresino - 10.32 kB - 04/03/2025 at 11:14 |
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My DST procedures.inoThe DST procedures onlyino - 4.70 kB - 04/03/2025 at 11:14 |
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If your microcontroller has WiFi I would recommend getting the exact time from the internet. Corrected for daylight saving time or not. No RTC or battery needed. The time from a RTC drifts a few seconds a month. Internet time does not.
Project is here: https://hackaday.io/project/174577-free-highly-accurate-time-and-date-from-internet
I use NodeMCU/esp8266 for WiFi functions but have ordered an Arduino Nano ESP32 for future projects.
Jeroen Brinkman
Roni Bandini
M. Bindhammer
nodemcu12ecanada
roy
That is certainly an option. But if an aluminium enclosure is used and/or your board has no WiFi, this is the option to go for. Because DST is not trivial. This approach, where the clock stays in wintertime, is a very elegant and simple solution. It will be included in the next version of "RTClib.h" when this is released.