Clarify that Date.p.setDate() uses local time (#3172)

Fixes #2833
mdn · Mar 16, 2021 · 0a67569 · 0a67569
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diff --git a/files/en-us/web/javascript/reference/global_objects/date/setdate/index.html b/files/en-us/web/javascript/reference/global_objects/date/setdate/index.html
@@ -10,8 +10,9 @@
 ---
 <div>{{JSRef}}</div>
 
-<p>The <strong><code>setDate()</code></strong> method sets the day of the
-  {{jsxref("Date")}} object relative to the beginning of the currently set month.</p>
+<p>The <strong><code>setDate()</code></strong> method changes the day of the month of a given {{jsxref("Date")}} instance, based on local time.</p>
+
+<p>To instead change the day of the month for a given {{jsxref("Date")}} instance based on UTC time, use the {{jsxref("Date.prototype.setUTCDate()", "setUTCDate()")}} method.</p>
 
 <div>{{EmbedInteractiveExample("pages/js/date-setdate.html")}}</div>
 

diff --git a/files/en-us/web/javascript/reference/global_objects/date/setutcdate/index.html b/files/en-us/web/javascript/reference/global_objects/date/setutcdate/index.html
@@ -10,8 +10,9 @@
 ---
 <div>{{JSRef}}</div>
 
-<p>The <strong><code>setUTCDate()</code></strong> method sets the day of the month for a
-  specified date according to universal time.</p>
+<p>The <strong><code>setUTCDate()</code></strong> method changes the day of the month of a given {{jsxref("Date")}} instance, based on UTC time.</p>
+
+<p>To instead change the day of the month for a given {{jsxref("Date")}} instance based on local time, use the {{jsxref("Date.prototype.setDate()", "setDate()")}} method.</p>
 
 <div>{{EmbedInteractiveExample("pages/js/date-setutcdate.html")}}</div>