How to get the difference between the current date and time and some date and time in the future or past on arduino?

V

Vladimir2017-08-17 23:53:22

Arduino

Vladimir, 2017-08-17 23:53:22

Good day to all. Please help with the question: how can I calculate the difference between the current date and time value and some arbitrary date and time value.
From iron, there is an Arduino Uno-compatible, RTC DS1302 and an LCD 2004 I2C screen.
Thanks in advance for the suggested thoughts.

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Hoksmur, 2017-08-18
@Hoksmur

Implement or find the datetime library. One of the easiest to implement is storing the number of days from a reference date in float format like Pascal/Delphi. Resource intensive, but easy to understand. It is possible as the number of seconds - then you can try to get by with 32-bit integers.
Pitfall: leap years and incremental seconds. I would suggest storing some dates in the form of a table of constants for the intended time range.
There is also a ready one: playground.arduino.cc/Code/DateTime but I don’t know how much memory it will eat.