# 45-haskell-time-windows

This example shows maintenance-window status checks with `Data.Time`.

It includes:

- one set of UTC maintenance windows,
- functions that parse timestamps and classify whether a window is active or still upcoming, and
- a test suite run by `nix flake check`.

Useful commands:

```bash
nix develop
cabal run
cabal run -- 2026-05-05T11:45:00Z
cabal test

nix build
./result/bin/mini-time-windows 2026-05-05T11:45:00Z

nix run . -- 2026-05-05T11:45:00Z
nix flake check
```