Function humantime_serde::option::serialize

pub fn serialize<T, S>(d: &Option<T>, s: S) -> Result<S::Ok, S::Error> where
    for<'a> Serde<&'a T>: Serialize,
    S: Serializer, 

Serializes an Option<Duration> or Option<SystemTime>

This function can be used with serde_derive’s with and deserialize_with annotations.