tzf-rs is used at run time in 5 crates (of which 1 optionally).

Depender (with downloads and own rev deps) tzf-rs version
1.6K remindee-bot ^0.4.4
1.0K automatic-timezoned =0.4.13
250 redizone ^0.4.10
600 opening-hours optional ^0.4
ruhr ^0.4.8