From 6b332b18f11d7b1be53f22faf2df97bf4afb4f0f Mon Sep 17 00:00:00 2001
From: Enyium <123484196+Enyium@users.noreply.github.com>
Date: Mon, 27 Nov 2023 21:40:15 +0100
Subject: [PATCH 1/4] Correct `from_i64()`.

Calculation of `nsecs` was off by a factor of 100! I didn't touch the tests; since they will have worked with the incorrect code, they will be incorrect also.
---
 src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index e288a09..dfe15b8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -100,7 +100,7 @@ impl FileTime {
     pub fn from_i64(filetime: i64) -> Self {
         assert!(filetime >= 0, "Only positive values allowed");
         let secs: i64 = filetime / Self::HUNDREDS_OF_NANOSECONDS;
-        let nsecs: i64 = filetime % Self::HUNDREDS_OF_NANOSECONDS;
+        let nsecs: i64 = filetime % Self::HUNDREDS_OF_NANOSECONDS * 100;
 
         Self { secs, nsecs }
     }

From ffc1d8516711f3e193ace504b620f1bf76916664 Mon Sep 17 00:00:00 2001
From: tuxuser <462620+tuxuser@users.noreply.github.com>
Date: Wed, 29 Nov 2023 04:52:21 +0100
Subject: [PATCH 2/4] tests: Correct tests after algorithm fixup

---
 src/lib.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index dfe15b8..18d3665 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -186,13 +186,13 @@ mod test {
     #[test]
     fn from_datetime() {
         let dt = Utc.from_utc_datetime(
-            &DateTime::parse_from_rfc3339("2009-07-25T23:00:00.000001000Z")
+            &DateTime::parse_from_rfc3339("2009-07-25T23:00:00.0001Z")
                 .unwrap()
                 .naive_utc(),
         );
         assert_eq!(
-            FileTime::from_datetime(dt),
-            FileTime::from_i64(128930364000001000)
+            dt,
+            FileTime::from_i64(128930364000001000).into()
         );
     }
 
@@ -204,7 +204,7 @@ mod test {
             ft,
             FileTime {
                 secs: 13013971283,
-                nsecs: 1482830
+                nsecs: 148283000
             }
         );
     }
@@ -243,7 +243,7 @@ mod test {
         let dt = Utc
             .with_ymd_and_hms(30828, 9, 14, 2, 48, 5)
             .unwrap()
-            .checked_add_signed(Duration::nanoseconds(4775807))
+            .checked_add_signed(Duration::nanoseconds(477580700))
             .unwrap();
         assert_eq!(ft.to_datetime(), dt);
     }
@@ -252,7 +252,7 @@ mod test {
     fn filetime_one() {
         let ft = FileTime::from_i64(1);
         assert_eq!(ft.seconds(), 0);
-        assert_eq!(ft.nanoseconds(), 1);
+        assert_eq!(ft.nanoseconds(), 100);
     }
 
     #[test]

From bedc4004a57c14074acbdad6d3e5232a31852839 Mon Sep 17 00:00:00 2001
From: tuxuser <462620+tuxuser@users.noreply.github.com>
Date: Wed, 29 Nov 2023 04:58:49 +0100
Subject: [PATCH 3/4] ci: Bump minimum rust version to 1.57.0

---
 .github/workflows/test.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6b9dd96..81320a4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [beta, stable, 1.56.0]
+        rust: [beta, stable, 1.57.0]
 
     steps:
       - uses: actions/checkout@v3

From a70af719d45b5ce6f40d2b00a7031a59aad5be56 Mon Sep 17 00:00:00 2001
From: tuxuser <462620+tuxuser@users.noreply.github.com>
Date: Wed, 29 Nov 2023 05:12:46 +0100
Subject: [PATCH 4/4] Correct from_datetime() and filetime() methods

---
 src/lib.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 18d3665..f0bf20f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -81,7 +81,7 @@ impl FileTime {
     /// let ft_i64 = FileTime::now().filetime();
     /// ```
     pub fn filetime(&self) -> i64 {
-        (self.secs * Self::HUNDREDS_OF_NANOSECONDS) + self.nsecs
+        (self.secs * Self::HUNDREDS_OF_NANOSECONDS) + self.nsecs.checked_div(100).unwrap_or(0)
     }
 
     /// Return FILETIME epoch as DateTime<Utc>
@@ -115,7 +115,7 @@ impl FileTime {
     pub fn from_datetime(dt: DateTime<Utc>) -> Self {
         let nsecs = Self::EPOCH_AS_FILETIME
             + (dt.timestamp() * Self::HUNDREDS_OF_NANOSECONDS)
-            + dt.timestamp_subsec_nanos() as i64;
+            + dt.timestamp_subsec_nanos().checked_div(100).unwrap_or(0) as i64;
         Self::from_i64(nsecs)
     }
 
@@ -214,7 +214,7 @@ mod test {
         let bytes = [0xCE_u8, 0xEB, 0x7D, 0x1A, 0x61, 0x59, 0xCE, 0x01];
         let ft: [u8; 8] = FileTime {
             secs: 13013971283,
-            nsecs: 1482830,
+            nsecs: 148283000,
         }
         .into();
         assert_eq!(ft, bytes);