From c0ada32ce1aee446ae11dd11ba93c87085ba08fe Mon Sep 17 00:00:00 2001
From: yuankunzhang <fmcocoa@gmail.com>
Date: Thu, 26 Jun 2025 14:19:41 +0000
Subject: [PATCH] feat: support nanoseconds

---
 src/items/mod.rs       | 20 ++++++++++++++++++--
 src/items/primitive.rs |  8 ++++++--
 src/items/time.rs      | 13 ++++++++++---
 tests/time.rs          |  4 ----
 4 files changed, 34 insertions(+), 11 deletions(-)

diff --git a/src/items/mod.rs b/src/items/mod.rs
index 6285ba7..2812c4a 100644
--- a/src/items/mod.rs
+++ b/src/items/mod.rs
@@ -190,6 +190,7 @@ pub fn parse(input: &mut &str) -> ModalResult<Vec<Item>> {
     Ok(items)
 }
 
+#[allow(clippy::too_many_arguments)]
 fn new_date(
     year: i32,
     month: u32,
@@ -197,10 +198,11 @@ fn new_date(
     hour: u32,
     minute: u32,
     second: u32,
+    nano: u32,
     offset: FixedOffset,
 ) -> Option<DateTime<FixedOffset>> {
     let newdate = NaiveDate::from_ymd_opt(year, month, day)
-        .and_then(|naive| naive.and_hms_opt(hour, minute, second))?;
+        .and_then(|naive| naive.and_hms_nano_opt(hour, minute, second, nano))?;
 
     Some(DateTime::<FixedOffset>::from_local(newdate, offset))
 }
@@ -220,7 +222,8 @@ fn with_timezone_restore(
         .with_year(copy.year())?
         .with_hour(copy.hour())?
         .with_minute(copy.minute())?
-        .with_second(copy.second())?;
+        .with_second(copy.second())?
+        .with_nanosecond(copy.nanosecond())?;
     Some(x)
 }
 
@@ -274,6 +277,7 @@ fn at_date_inner(date: Vec<Item>, at: DateTime<FixedOffset>) -> Option<DateTime<
                     d.hour(),
                     d.minute(),
                     d.second(),
+                    d.nanosecond(),
                     *d.offset(),
                 )?;
             }
@@ -299,6 +303,7 @@ fn at_date_inner(date: Vec<Item>, at: DateTime<FixedOffset>) -> Option<DateTime<
                     hour,
                     minute,
                     second as u32,
+                    (second.fract() * 10f64.powi(9)).round() as u32,
                     offset,
                 )?;
             }
@@ -320,6 +325,7 @@ fn at_date_inner(date: Vec<Item>, at: DateTime<FixedOffset>) -> Option<DateTime<
                     hour,
                     minute,
                     second as u32,
+                    (second.fract() * 10f64.powi(9)).round() as u32,
                     offset,
                 )?;
             }
@@ -495,6 +501,16 @@ mod tests {
             test_eq_fmt("%Y-%m-%d %H:%M:%S %:z", "Jul 17 06:14:49 2024 GMT"),
         );
 
+        assert_eq!(
+            "2024-07-17 06:14:49.567 +00:00",
+            test_eq_fmt("%Y-%m-%d %H:%M:%S%.f %:z", "Jul 17 06:14:49.567 2024 GMT"),
+        );
+
+        assert_eq!(
+            "2024-07-17 06:14:49.567 +00:00",
+            test_eq_fmt("%Y-%m-%d %H:%M:%S%.f %:z", "Jul 17 06:14:49,567 2024 GMT"),
+        );
+
         assert_eq!(
             "2024-07-17 06:14:49 -03:00",
             test_eq_fmt("%Y-%m-%d %H:%M:%S %:z", "Jul 17 06:14:49 2024 BRT"),
diff --git a/src/items/primitive.rs b/src/items/primitive.rs
index c1f5180..80f91fe 100644
--- a/src/items/primitive.rs
+++ b/src/items/primitive.rs
@@ -120,9 +120,13 @@ pub(super) fn float<'a, E>(input: &mut &'a str) -> winnow::Result<f64, E>
 where
     E: ParserError<&'a str>,
 {
-    (opt(one_of(['+', '-'])), digit1, opt(preceded('.', digit1)))
+    (
+        opt(one_of(['+', '-'])),
+        digit1,
+        opt(preceded(one_of(['.', ',']), digit1)),
+    )
         .void()
         .take()
-        .verify_map(|s: &str| s.parse().ok())
+        .verify_map(|s: &str| s.replace(",", ".").parse().ok())
         .parse_next(input)
 }
diff --git a/src/items/time.rs b/src/items/time.rs
index da2a3c6..4a9bfc5 100644
--- a/src/items/time.rs
+++ b/src/items/time.rs
@@ -41,7 +41,7 @@ use std::fmt::Display;
 
 use chrono::FixedOffset;
 use winnow::{
-    ascii::{digit1, float},
+    ascii::digit1,
     combinator::{alt, opt, peek, preceded},
     error::{ContextError, ErrMode, StrContext, StrContextValue},
     seq,
@@ -53,7 +53,7 @@ use winnow::{
 use crate::ParseDateTimeError;
 
 use super::{
-    primitive::{dec_uint, s},
+    primitive::{dec_uint, float, s},
     relative,
 };
 
@@ -226,7 +226,14 @@ fn minute(input: &mut &str) -> ModalResult<u32> {
 
 /// Parse a number of seconds (preceded by whitespace)
 fn second(input: &mut &str) -> ModalResult<f64> {
-    s(float).verify(|x| *x < 60.0).parse_next(input)
+    s(float)
+        .verify(|x| *x < 60.0)
+        .map(|x| {
+            // Truncates the fractional part of seconds to 9 digits.
+            let factor = 10f64.powi(9);
+            (x * factor).trunc() / factor
+        })
+        .parse_next(input)
 }
 
 pub(crate) fn timezone(input: &mut &str) -> ModalResult<Offset> {
diff --git a/tests/time.rs b/tests/time.rs
index e07370d..d0a4765 100644
--- a/tests/time.rs
+++ b/tests/time.rs
@@ -34,12 +34,10 @@ pub fn check_time(input: &str, expected: &str, format: &str, base: Option<DateTi
 #[case::full_time_with_spaces("12 : 34 : 56", "12:34:56.000000000")]
 #[case::full_time_midnight("00:00:00", "00:00:00.000000000")]
 #[case::full_time_almost_midnight("23:59:59", "23:59:59.000000000")]
-/* TODO: https://github.com/uutils/parse_datetime/issues/165
 #[case::full_time_decimal_seconds("12:34:56.666", "12:34:56.666000000")]
 #[case::full_time_decimal_seconds("12:34:56.999999999", "12:34:56.999999999")]
 #[case::full_time_decimal_seconds("12:34:56.9999999999", "12:34:56.999999999")]
 #[case::full_time_decimal_seconds_after_comma("12:34:56,666", "12:34:56.666000000")]
-*/
 #[case::without_seconds("12:34", "12:34:00.000000000")]
 fn test_time_24h_format(#[case] input: &str, #[case] expected: &str) {
     check_time(input, expected, "%H:%M:%S%.9f", None);
@@ -54,10 +52,8 @@ fn test_time_24h_format(#[case] input: &str, #[case] expected: &str) {
 #[case::full_time_capital("12:34:56pm", "12:34:56.000000000")]
 #[case::full_time_midnight("00:00:00", "00:00:00.000000000")]
 #[case::full_time_almost_midnight("23:59:59", "23:59:59.000000000")]
-/* TODO: https://github.com/uutils/parse_datetime/issues/165
 #[case::full_time_decimal_seconds("12:34:56.666pm", "12:34:56.666000000")]
 #[case::full_time_decimal_seconds_after_comma("12:34:56,666pm", "12:34:56.666000000")]
-*/
 #[case::without_seconds("12:34pm", "12:34:00.000000000")]
 fn test_time_12h_format(#[case] input: &str, #[case] expected: &str) {
     check_time(input, expected, "%H:%M:%S%.9f", None);