diff --git a/src/error.rs b/src/error.rs
index fd08412..1024f82 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -8,6 +8,7 @@ pub enum Error {
     FromUint,
     Range,
     ParseInt,
+    ParseGitRev,
     ParsePreRelease,
     ParseSemver,
     TryFromInt,
@@ -32,3 +33,9 @@ impl From<ParseIntError> for Error {
         Self::ParseInt
     }
 }
+
+impl From<chrono::ParseError> for Error {
+    fn from(_value: chrono::ParseError) -> Self {
+        Self::ParseGitRev
+    }
+}
diff --git a/src/extended.rs b/src/extended.rs
index 63fcf6e..b72b303 100644
--- a/src/extended.rs
+++ b/src/extended.rs
@@ -1,5 +1,5 @@
 use {
-    crate::{Error, PreRelease, MAX_U12},
+    crate::{Error, PreRelease, Rapid, SemVer, Simple, MAX_U12},
     serde::{Deserialize, Serialize},
     std::{cmp::Ordering, fmt, str::FromStr},
 };
@@ -119,3 +119,87 @@ impl PartialOrd for Extended {
         Some(self.cmp(other))
     }
 }
+
+impl From<Simple> for Extended {
+    fn from(value: Simple) -> Self {
+        Self {
+            major: value.major,
+            minor: 0,
+            patch: 0,
+            build: 0,
+            pre: value.pre,
+        }
+    }
+}
+
+impl From<Rapid> for Extended {
+    fn from(value: Rapid) -> Self {
+        Self {
+            major: value.major,
+            minor: value.minor,
+            patch: 0,
+            build: 0,
+            pre: value.pre,
+        }
+    }
+}
+
+impl From<SemVer> for Extended {
+    fn from(value: SemVer) -> Self {
+        Self {
+            major: value.major,
+            minor: value.minor,
+            patch: value.patch,
+            build: 0,
+            pre: value.pre,
+        }
+    }
+}
+
+impl PartialEq<SemVer> for Extended {
+    fn eq(&self, other: &SemVer) -> bool {
+        self.major == other.major
+            && self.minor == other.minor
+            && self.patch == other.patch
+            && self.build == 0
+            && self.pre == other.pre
+    }
+}
+
+impl PartialEq<Rapid> for Extended {
+    fn eq(&self, other: &Rapid) -> bool {
+        self.major == other.major
+            && self.minor == other.minor
+            && self.patch == 0
+            && self.build == 0
+            && self.pre == other.pre
+    }
+}
+
+impl PartialEq<Simple> for Extended {
+    fn eq(&self, other: &Simple) -> bool {
+        self.major == other.major
+            && self.minor == 0
+            && self.patch == 0
+            && self.build == 0
+            && self.pre == other.pre
+    }
+}
+
+impl PartialOrd<SemVer> for Extended {
+    fn partial_cmp(&self, other: &SemVer) -> Option<Ordering> {
+        Some(u64::from(*self).cmp(&u64::from(*other)))
+    }
+}
+
+impl PartialOrd<Rapid> for Extended {
+    fn partial_cmp(&self, other: &Rapid) -> Option<Ordering> {
+        Some(u64::from(*self).cmp(&u64::from(*other)))
+    }
+}
+
+impl PartialOrd<Simple> for Extended {
+    fn partial_cmp(&self, other: &Simple) -> Option<Ordering> {
+        Some(u64::from(*self).cmp(&u64::from(*other)))
+    }
+}
diff --git a/src/gitrev.rs b/src/gitrev.rs
index e69de29..54f34fa 100644
--- a/src/gitrev.rs
+++ b/src/gitrev.rs
@@ -0,0 +1,84 @@
+use {
+    crate::Error,
+    chrono::{offset::Utc, DateTime},
+    serde::{Deserialize, Serialize},
+    std::{cmp::Ordering, fmt, str::FromStr},
+};
+
+#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
+/// Represents a Git revision
+pub struct GitRev {
+    /// the short revision hash
+    pub hash: String,
+    /// the time of the revision commit
+    pub datetime: DateTime<Utc>,
+}
+
+impl fmt::Display for GitRev {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "git_{}.{}", self.hash, self.datetime.format("%Y%m%d"))
+    }
+}
+
+impl PartialOrd for GitRev {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        self.datetime.partial_cmp(&other.datetime)
+    }
+}
+
+impl Ord for GitRev {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.datetime.cmp(&other.datetime)
+    }
+}
+
+impl FromStr for GitRev {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        if let Some(gitrev) = s.strip_prefix("git_") {
+            if let Some((hash, date)) = gitrev.split_once('_') {
+                if hash.len() == 7 {
+                    let datetime = DateTime::parse_from_str(date, "%Y%m%d")?;
+                    return Ok(Self {
+                        hash: hash.to_string(),
+                        datetime: datetime.into(),
+                    });
+                }
+            }
+        }
+        Err(Error::ParseGitRev)
+    }
+}
+/*
+impl TryFrom<Version> for GitRev {
+    type Error = ParseGitRevError;
+
+    fn try_from(value: Version) -> Result<Self, Self::Error> {
+        match value {
+            Version::Git(g) => Ok(g),
+            _ => Err(ParseGitRevError),
+        }
+    }
+}*/
+
+#[cfg(test)]
+mod test {
+    use std::{thread, time::Duration};
+
+    use super::*;
+
+    #[test]
+    fn ord() {
+        let a = GitRev {
+            hash: "aaab".to_string(),
+            datetime: Utc::now(),
+        };
+        thread::sleep(Duration::from_millis(10));
+        let b = GitRev {
+            hash: "aaaa".to_string(),
+            datetime: Utc::now(),
+        };
+        assert!(a < b);
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 66249d0..2100744 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,13 +1,23 @@
 mod error;
 mod extended;
+mod gitrev;
 mod prerelease;
 mod rapid;
 mod semver;
 mod simple;
 
 pub use {
-    error::Error, extended::Extended, prerelease::PreRelease, rapid::Rapid, semver::SemVer,
-    simple::Simple,
+    error::Error, extended::Extended, gitrev::GitRev, prerelease::PreRelease, rapid::Rapid,
+    semver::SemVer, simple::Simple,
 };
 
 pub static MAX_U12: u16 = 4096;
+
+#[derive(Clone, Debug)]
+pub enum Version {
+    Simple(Simple),
+    Rapid(Rapid),
+    SemVer(SemVer),
+    Extended(Extended),
+    GitRev(GitRev),
+}