fixup: Some TLC for msrv.

src/date.rs

@@ -77,7 +77,7 @@ impl<Tz: TimeZone> Date<Tz> {
     //
     // note: this constructor is purposely not named to `new` to discourage the direct usage.
     #[inline]
-    pub const fn from_utc(date: NaiveDate, offset: Tz::Offset) -> Date<Tz> {
+    pub fn from_utc(date: NaiveDate, offset: Tz::Offset) -> Date<Tz> {
         Date { date, offset }
     }
 
@@ -227,7 +227,7 @@ impl<Tz: TimeZone> Date<Tz> {
 
     /// Retrieves an associated offset from UTC.
     #[inline]
-    pub const fn offset(&self) -> &Tz::Offset {
+    pub fn offset(&self) -> &Tz::Offset {
         &self.offset
     }
 
@@ -274,7 +274,7 @@ impl<Tz: TimeZone> Date<Tz> {
 
     /// Returns a view to the naive UTC date.
     #[inline]
-    pub const fn naive_utc(&self) -> NaiveDate {
+    pub fn naive_utc(&self) -> NaiveDate {
         self.date
     }
 
@@ -284,7 +284,7 @@ impl<Tz: TimeZone> Date<Tz> {
     /// because the offset is restricted to never exceed one day,
     /// but provided for the consistency.
     #[inline]
-    pub const fn naive_local(&self) -> NaiveDate {
+    pub fn naive_local(&self) -> NaiveDate {
         self.date
     }
 

src/datetime/mod.rs

@@ -108,7 +108,7 @@ impl<Tz: TimeZone> DateTime<Tz> {
     //
     // note: this constructor is purposely not named to `new` to discourage the direct usage.
     #[inline]
-    pub const fn from_utc(datetime: NaiveDateTime, offset: Tz::Offset) -> DateTime<Tz> {
+    pub fn from_utc(datetime: NaiveDateTime, offset: Tz::Offset) -> DateTime<Tz> {
         DateTime { datetime, offset }
     }
 
@@ -288,7 +288,7 @@ impl<Tz: TimeZone> DateTime<Tz> {
 
     /// Retrieves an associated offset from UTC.
     #[inline]
-    pub const fn offset(&self) -> &Tz::Offset {
+    pub fn offset(&self) -> &Tz::Offset {
         &self.offset
     }
 
@@ -380,7 +380,7 @@ impl<Tz: TimeZone> DateTime<Tz> {
 
     /// Returns a view to the naive UTC datetime.
     #[inline]
-    pub const fn naive_utc(&self) -> NaiveDateTime {
+    pub fn naive_utc(&self) -> NaiveDateTime {
         self.datetime
     }
 

src/format/mod.rs

@@ -867,11 +867,7 @@ pub struct DelayedFormat<I> {
 #[cfg(any(feature = "alloc", feature = "std", test))]
 impl<'a, I: Iterator<Item = B> + Clone, B: Borrow<Item<'a>>> DelayedFormat<I> {
     /// Makes a new `DelayedFormat` value out of local date and time.
-    pub const fn new(
-        date: Option<NaiveDate>,
-        time: Option<NaiveTime>,
-        items: I,
-    ) -> DelayedFormat<I> {
+    pub fn new(date: Option<NaiveDate>, time: Option<NaiveTime>, items: I) -> DelayedFormat<I> {
         DelayedFormat {
             date,
             time,
@@ -906,7 +902,7 @@ impl<'a, I: Iterator<Item = B> + Clone, B: Borrow<Item<'a>>> DelayedFormat<I> {
     /// Makes a new `DelayedFormat` value out of local date and time and locale.
     #[cfg(feature = "unstable-locales")]
     #[cfg_attr(docsrs, doc(cfg(feature = "unstable-locales")))]
-    pub const fn new_with_locale(
+    pub fn new_with_locale(
         date: Option<NaiveDate>,
         time: Option<NaiveTime>,
         items: I,

src/naive/date.rs

@@ -1099,7 +1099,7 @@ impl NaiveDate {
     #[cfg(any(feature = "alloc", feature = "std", test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
     #[inline]
-    pub const fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
+    pub fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
     where
         I: Iterator<Item = B> + Clone,
         B: Borrow<Item<'a>>,
@@ -1150,7 +1150,7 @@ impl NaiveDate {
     #[cfg(feature = "unstable-locales")]
     #[cfg_attr(docsrs, doc(cfg(feature = "unstable-locales")))]
     #[inline]
-    pub const fn format_localized_with_items<'a, I, B>(
+    pub fn format_localized_with_items<'a, I, B>(
         &self,
         items: I,
         locale: Locale,

src/naive/datetime/mod.rs

@@ -820,7 +820,7 @@ impl NaiveDateTime {
     #[cfg(any(feature = "alloc", feature = "std", test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
     #[inline]
-    pub const fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
+    pub fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
     where
         I: Iterator<Item = B> + Clone,
         B: Borrow<Item<'a>>,

src/naive/datetime/serde.rs

@@ -1106,7 +1106,7 @@ enum SerdeError<V: fmt::Display, D: fmt::Display> {
 }
 
 /// Construct a [`SerdeError::NonExistent`]
-const fn ne_timestamp<T: fmt::Display>(ts: T) -> SerdeError<T, u8> {
+fn ne_timestamp<T: fmt::Display>(ts: T) -> SerdeError<T, u8> {
     SerdeError::NonExistent::<T, u8> { timestamp: ts }
 }
 

src/naive/time/mod.rs

@@ -692,7 +692,7 @@ impl NaiveTime {
     #[cfg(any(feature = "alloc", feature = "std", test))]
     #[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
     #[inline]
-    pub const fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
+    pub fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
     where
         I: Iterator<Item = B> + Clone,
         B: Borrow<Item<'a>>,