From 9f469ad187e80854c9b3aaffa2feca8ad5b77fd3 Mon Sep 17 00:00:00 2001
From: Tanaka Akira <akr@fsij.org>
Date: Fri, 7 Jun 2024 00:25:38 +0900
Subject: [PATCH] [DOC] Time uses the proleptic Gregorian calendar.

---
 timev.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/timev.rb b/timev.rb
index a75f74d517..ad8b16a0e2 100644
--- a/timev.rb
+++ b/timev.rb
@@ -63,6 +63,10 @@
 # due to the C types "time_t" and "struct tm".
 # If that limit is exceeded, Ruby extrapolates the localtime function.
 #
+# The Time class always uses the Gregorian calendar.
+# I.e. the proleptic Gregorian calendar is used.
+# Other calendars, such as Julian calendar, are not supported.
+#
 # "time_t" can represent 1901-12-14 to 2038-01-19 if it is 32 bit signed integer,
 # -292277022657-01-27 to 292277026596-12-05 if it is 64 bit signed integer.
 # However "localtime" on some platforms doesn't supports negative time_t (before 1970).