diff --git a/base/ltfiles.dtx b/base/ltfiles.dtx
index 1b21d36d6..6960fd44a 100644
--- a/base/ltfiles.dtx
+++ b/base/ltfiles.dtx
@@ -234,7 +234,7 @@
 % \changes{v0.9e}{1993/12/09}{Hook added}
 %    \begin{macrocode}
 %</2ekernel>
-%<latexrelease>\IncludeInRelease{2017/03/10}%
+%<latexrelease>\IncludeInRelease{2017/04/15}%
 %<latexrelease>  {\document}{Save language for hyphenation}%
 %<*2ekernel|latexrelease>
 %    \end{macrocode}
diff --git a/base/ltoutput.dtx b/base/ltoutput.dtx
index 254b10457..8cfeb3fc7 100644
--- a/base/ltoutput.dtx
+++ b/base/ltoutput.dtx
@@ -2038,7 +2038,7 @@
 %    internal commands as hooks.
 %    \begin{macrocode}
 %</2ekernel>
-%<latexrelease>\IncludeInRelease{2017/03/10}%
+%<latexrelease>\IncludeInRelease{2017/04/15}%
 %<latexrelease>  {\@outputpage}{Reset language for hyphenation}%
 %<*2ekernel|latexrelease>
 \def\@outputpage{%
diff --git a/base/ltplain.dtx b/base/ltplain.dtx
index 03f90565e..5c4050b73 100644
--- a/base/ltplain.dtx
+++ b/base/ltplain.dtx
@@ -1459,7 +1459,7 @@
 % \changes{v2.0d}{2015/02/20}{Spell commands correctly :-)}
 % \changes{v2.0g}{2015/03/10}{Reorganise to be less noisy}
 %    \begin{macrocode}
-%<latexrelease>\IncludeInRelease{2015/01/20}{\loggingall}{etex tracing}%
+%<latexrelease>\IncludeInRelease{2015/01/01}{\loggingall}{etex tracing}%
 %<*2ekernel|latexrelease>
 \ifx\tracingscantokens\@undefined
 \gdef\loggingall{%
@@ -1511,7 +1511,7 @@
 % \begin{macro}{\hideoutput}
 % \changes{v2.0g}{2015/03/10}{macro added}
 %    \begin{macrocode}
-%<latexrelease>\IncludeInRelease{2015/01/20}{\tracingnone}%
+%<latexrelease>\IncludeInRelease{2015/01/01}{\tracingnone}%
 %<latexrelease>                             {turn off etex tracing}%
 %<*2ekernel|latexrelease>
 \ifx\tracingscantokens\@undefined