use chrono::NaiveDate;
use git2::Time;

fn date_from_time(time: &Time) -> NaiveDate {
    chrono::NaiveDateTime::from_timestamp(time.seconds(), 0).date()
}

    fn find_version_date(&self, spec: &str) -> Result<NaiveDate, Error> {
        let obj = self.git.repo.revparse_single(spec)?;
        Ok(
            if let Some(date) = obj
                .as_tag()
                .and_then(|tag| tag.tagger())
                .map(|tagger| tagger.when())
                .map(|time| date_from_time(&time))
            {
                date
            } else {
                let commit = obj.peel_to_commit()?;
                date_from_time(&commit.time())
            },
        )
    }

        let mut version_date = None;

        let version_date = self.find_version_date(from_rev.0)?;

                    if version_date.is_none() {
                        version_date = Some(date);
                    }

        if let Some(date) = version_date {
            builder = builder.date(date);
        }

        builder = builder.date(version_date);

    repo: Repository,

    pub(crate) repo: Repository,