use chrono::{DateTime}; let dt_from = DateTime::parse_from_str(&format!("{0} 0:0 +0000",_date_from.unwrap()), "%Y%m%d %H:%M %z").unwrap(); let dt_until = DateTime::parse_from_str(&format!("{0} 0:0 +0000",_date_until.unwrap()), "%Y%m%d %H:%M %z").unwrap(); let diff = dt_until.signed_duration_since(dt_from); println!("{:?}",diff)

https://stackoverflow.com/questions/49487722/how-do-i-get-duration-from-two-datetime-naivedatetime

result is a Duration Rust object : println!("{:?}",diff.num_days()); 24.01.23

https://docs.rs/chrono/latest/chrono/struct.Duration.html#method.days

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