> For the complete documentation index, see [llms.txt](https://docs.blockxnet.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blockxnet.com/protocol-developers/modules/epochs/concepts.md).

# Concepts

The `epochs` module defines on-chain timers that execute at fixed time intervals. Other BlockX modules can then register logic to be executed at the timer ticks. We refer to the period in between two timer ticks as an "epoch".

Every timer has a unique identifier, and every epoch will have a start time and an end time, where `end time = start time + timer interval`.