https://git.ruby-lang.org/ruby.git/commit/?id=4efbeb1190

From 4efbeb11905534289a6b4a4bc4779859a9c6c6a6 Mon Sep 17 00:00:00 2001
From: Burdette Lamar <BurdetteLamar@Y...>
Date: Sat, 30 Jul 2022 13:18:29 -0500
Subject: [ruby/date] Enhanced RDoc (https://github.com/ruby/date/pull/67)

Treats:
    ::httpdate
    #to_date
    #to_time
    #to_datetime
In behalf of ::httpdate, I've introduced section "Argument limit" that can be pointed to by various Date methods (similar to existing section "Argument start"). This will involve 8 already-enhanced methods plus 8 more not yet done.

https://github.com/ruby/date/commit/00326ff99c
---
 ext/date/date_core.c | 44 ++++++++++++++++++++++++++++++++++----------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/ext/date/date_core.c b/ext/date/date_core.c
index d8048194ce..762fb7281c 100644
--- a/ext/date/date_core.c
+++ b/ext/date/date_core.c
@@ -4833,11 +4833,14 @@ date_s_rfc2822(int argc, VALUE *argv, VALUE klass) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L4833
  * call-seq:
  *   Date._httpdate(string, limit: 128) -> hash
  *
- * Returns a hash of parsed elements.
+ * Returns a hash of values parsed from +string+:
  *
- * Raise an ArgumentError when the string length is longer than _limit_.
- * You can stop this check by passing <code>limit: nil</code>, but note
- * that it may take a long time to parse.
+ *   d = Date.new(2001, 2, 3)
+ *   s = d.httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"
+ *   Date._httpdate(s)
+ *   # => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"GMT", :offset=>0}
+ *
+ * See argument {limit}[rdoc-ref:Date@Argument+limit].
  */
 static VALUE
 date_s__httpdate(int argc, VALUE *argv, VALUE klass)
@@ -8760,10 +8763,15 @@ time_to_datetime(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L8763
 
 /*
  * call-seq:
- *    d.to_time  ->  time
+ *   to_time -> time
+ *
+ * Returns a new Time object with the same value as +self+;
+ * if +self+ is a Julian date, derives its Gregorian date
+ * for conversion to the \Time object:
+ *
+ *   Date.new(2001, 2, 3).to_time               # => 2001-02-03 00:00:00 -0600
+ *   Date.new(2001, 2, 3, Date::JULIAN).to_time # => 2001-02-16 00:00:00 -0600
  *
- * Returns a Time object which denotes self. If self is a julian date,
- * convert it to a gregorian date before converting it to Time.
  */
 static VALUE
 date_to_time(VALUE self)
@@ -8784,9 +8792,9 @@ date_to_time(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L8792
 
 /*
  * call-seq:
- *    d.to_date  ->  self
+ *   to_date -> self
  *
- * Returns self.
+ * Returns +self+.
  */
 static VALUE
 date_to_date(VALUE self)
@@ -8798,7 +8806,10 @@ date_to_date(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L8806
  * call-seq:
  *    d.to_datetime  -> datetime
  *
- * Returns a DateTime object which denotes self.
+ * Returns a DateTime whose value is the same as +self+:
+ *
+ *   Date.new(2001, 2, 3).to_datetime # => #<DateTime: 2001-02-03T00:00:00+00:00>
+ *
  */
 static VALUE
 date_to_datetime(VALUE self)
@@ -9498,6 +9509,19 @@ Init_date_core(void) https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L9509
      * - Date::JULIAN - no changeover date; all dates are Julian.
      * - Date::GREGORIAN - no changeover date; all dates are Gregorian.
      *
+     * === Argument +limit+
+     *
+     * Certain singleton methods in \Date that parse string arguments
+     * also take optional keyword argument +limit+,
+     * which can limit the length of the string argument.
+     *
+     * When +limit+ is:
+     *
+     * - Non-negative:
+     *   raises ArgumentError if the string length is greater than _limit_.
+     * - Other numeric or +nil+: ignores +limit+.
+     * - Other non-numeric: raises TypeError.
+     *
      */
     cDate = rb_define_class("Date", rb_cObject);
 
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