Fix typo: js_JP is not a valid locale.
diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst
index 0de7391..db95269 100644
--- a/Doc/library/datetime.rst
+++ b/Doc/library/datetime.rst
@@ -1720,7 +1720,7 @@
making assumptions about the output value. Field orderings will vary (for
example, "month/day/year" versus "day/month/year"), and the output may
contain Unicode characters encoded using the locale's default encoding (for
- example, if the current locale is ``js_JP``, the default encoding could be
+ example, if the current locale is ``ja_JP``, the default encoding could be
any one of ``eucJP``, ``SJIS``, or ``utf-8``; use :meth:`locale.getlocale`
to determine the current locale's encoding).