Cargo Features

[dependencies]
iso8601 = { version = "0.6.1", default-features = false, features = ["std", "chrono", "serde"] }
default = std

The std feature is set by default whenever iso8601 is added without default-features = false somewhere in the dependency tree.

std default

Enables std of nom

chrono = num-traits

Enables chrono

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

num-traits chrono?
serde implicit feature

Enables serde

serde:

A generic serialization/deserialization framework