This is a library for extending the millis() and micros() overflow timers for Ardunio. The library modifies the existing timer0 overflow ISR to extend the maximum time for millis and micros into a unsigned 64 bit number rather than a unsigned 32 bit number. To access the new values simply run extendedMillis();, or extendedMicros();. These will stand in for the standard millis micros calls but return a unsigned 64 bit number of milliseconds or microseconds respectively.

I hope this helps.

Search for ExtendedTime in the Arduino Library Manager and install the latest version.

If you would like to install manually, you can follow these steps:

1. Download the latest release
2. Extract and place the folder in ~/Arduino/libraries/

This library is licensed under the GNU Lesser General Public License v2.1 or later (LGPL 2.1+).

This means you are free to use, modify, and distribute this library under the terms of the LGPL 2.1+.
However, if you modify and distribute this library, you must also release the modified version under the same LGPL license.

For more details, see the LICENSE file.