diff --git a/NEWS b/NEWS
index 60eea27dd42..85f4638ba7d 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,8 @@ PHP                                                                        NEWS
 
 - Calendar:
   . Fixed GH-16240: jdtounix overflow on argument value. (David Carlier)
+  . Fixed GH-16241: easter_days/easter_date overflow on year argument.
+    (David Carlier)
 
 - CLI:
   . Fixed bug GH-16137: duplicate http headers when set several times by
diff --git a/ext/calendar/easter.c b/ext/calendar/easter.c
index d6ff54fa0f6..84eb9ea12a8 100644
--- a/ext/calendar/easter.c
+++ b/ext/calendar/easter.c
@@ -33,6 +33,7 @@ static void _cal_easter(INTERNAL_FUNCTION_PARAMETERS, bool gm)
 	struct tm te;
 	zend_long year, golden, solar, lunar, pfm, dom, tmp, easter, result;
 	zend_long method = CAL_EASTER_DEFAULT;
+	const zend_long max_year = ZEND_LONG_MAX / 1.25;
 	bool year_is_null = 1;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS(),
@@ -53,6 +54,11 @@ static void _cal_easter(INTERNAL_FUNCTION_PARAMETERS, bool gm)
 		}
 	}
 
+	if (year <= 0 || year > max_year) {
+		zend_argument_value_error(1, "must be between 1 and " ZEND_LONG_FMT, max_year);
+		RETURN_THROWS();
+	}
+
 	#ifdef ZEND_ENABLE_ZVAL_LONG64
 	/* Compiling for 64bit, allow years between 1970 and 2.000.000.000 */
 	if (gm && year < 1970) {
diff --git a/ext/calendar/tests/gh16228.phpt b/ext/calendar/tests/gh16228.phpt
new file mode 100644
index 00000000000..9ce80688195
--- /dev/null
+++ b/ext/calendar/tests/gh16228.phpt
@@ -0,0 +1,26 @@
+--TEST--
+GH-16228 (easter_days, Overflow on year argument)
+--EXTENSIONS--
+calendar
+--FILE--
+<?php
+try {
+	easter_days(PHP_INT_MAX, 0);
+} catch (\ValueError $e) {
+	echo $e->getMessage() . PHP_EOL;
+}
+try {
+	easter_days(-1, 0);
+} catch (\ValueError $e) {
+	echo $e->getMessage() . PHP_EOL;
+}
+try {
+	easter_date(PHP_INT_MAX, 0);
+} catch (\ValueError $e) {
+	echo $e->getMessage() . PHP_EOL;
+}
+?>
+--EXPECTF--
+easter_days(): Argument #1 ($year) must be between 1 and %d
+easter_days(): Argument #1 ($year) must be between 1 and %d
+easter_date(): Argument #1 ($year) must be between 1 and %d