https://git.ruby-lang.org/ruby.git/commit/?id=83bdc2f00c

From 83bdc2f00c4565a091d88399e5a315a96f6afed6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 9 Nov 2021 15:12:02 +0900
Subject: Simplify default values of `Time.at` [Bug #18293]

---
 time.c   | 6 +++---
 timev.rb | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/time.c b/time.c
index 6fa4047e297..9ecc09347cd 100644
--- a/time.c
+++ b/time.c
@@ -2678,13 +2678,13 @@ get_scale(VALUE unit) https://github.com/ruby/ruby/blob/trunk/time.c#L2678
 }
 
 static VALUE
-time_s_at(rb_execution_context_t *ec, VALUE klass, VALUE time, VALUE subsec, VALUE unit, VALUE zone, VALUE nosubsec, VALUE nounit)
+time_s_at(rb_execution_context_t *ec, VALUE klass, VALUE time, VALUE subsec, VALUE unit, VALUE zone)
 {
     VALUE t;
     wideval_t timew;
 
-    if (!RTEST(nosubsec)) {
-        int scale = !RTEST(nounit) ? get_scale(unit) : 1000000;
+    if (!NIL_P(subsec)) {
+        int scale = get_scale(unit);
         time = num_exact(time);
         t = num_exact(subsec);
         timew = wadd(rb_time_magnify(v2w(time)), wmulquoll(v2w(t), TIME_SCALE, scale));
diff --git a/timev.rb b/timev.rb
index 1be675df35d..b73d8c8cc0a 100644
--- a/timev.rb
+++ b/timev.rb
@@ -267,8 +267,8 @@ class Time https://github.com/ruby/ruby/blob/trunk/timev.rb#L267
   # :include: doc/time/nsec.rdoc
   # :include: doc/time/in.rdoc
   #
-  def self.at(time, subsec = (nosubsec = true), unit = (nounit = true), in: nil)
-    __builtin.time_s_at(time, subsec, unit, __builtin.arg!(:in), nosubsec, nounit)
+  def self.at(time, subsec = nil, unit = :microsecond, in: nil)
+    __builtin.time_s_at(time, subsec, unit, __builtin.arg!(:in))
   end
 
   # Returns a new \Time object based the on given arguments.
-- 
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