Index: openacs-4/packages/acs-lang/tcl/lang-message-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-lang/tcl/lang-message-procs.tcl,v
diff -u -N -r1.68.2.14 -r1.68.2.15
--- openacs-4/packages/acs-lang/tcl/lang-message-procs.tcl	18 Feb 2021 12:45:13 -0000	1.68.2.14
+++ openacs-4/packages/acs-lang/tcl/lang-message-procs.tcl	18 Feb 2021 14:28:59 -0000	1.68.2.15
@@ -308,7 +308,7 @@
         ]
 }
 
-ad_proc -public lang::message::undelete {
+ad_proc -private lang::message::undelete {
     -package_key:required
     -message_key:required
     -locale:required
@@ -328,7 +328,7 @@
         ]
 }
 
-ad_proc -public lang::message::revert {
+ad_proc -private lang::message::revert {
     {-package_key:required}
     {-message_key:required}
     {-locale:required}
@@ -358,7 +358,7 @@
         $last_overwritten_message
 }
 
-ad_proc -public lang::message::get_element {
+ad_proc -private lang::message::get_element {
     -package_key:required
     -message_key:required
     -locale:required
@@ -573,7 +573,7 @@
     }
 }
 
-ad_proc -public lang::message::conflict_count {
+ad_proc -private lang::message::conflict_count {
     {-package_key ""}
     {-locale ""}
 } {
Index: openacs-4/packages/acs-lang/tcl/localization-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-lang/tcl/localization-procs.tcl,v
diff -u -N -r1.29.2.14 -r1.29.2.15
--- openacs-4/packages/acs-lang/tcl/localization-procs.tcl	21 Jul 2020 14:02:09 -0000	1.29.2.14
+++ openacs-4/packages/acs-lang/tcl/localization-procs.tcl	18 Feb 2021 14:28:59 -0000	1.29.2.15
@@ -378,7 +378,7 @@
     }]]
 }
 
-ad_proc -public lc_time_fmt_compile {
+ad_proc -private lc_time_fmt_compile {
     fmt
     locale
 } {
Index: openacs-4/packages/acs-lang/tcl/test/acs-lang-localization-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-lang/tcl/test/acs-lang-localization-procs.tcl,v
diff -u -N -r1.4.2.7 -r1.4.2.8
--- openacs-4/packages/acs-lang/tcl/test/acs-lang-localization-procs.tcl	15 Feb 2021 13:27:30 -0000	1.4.2.7
+++ openacs-4/packages/acs-lang/tcl/test/acs-lang-localization-procs.tcl	18 Feb 2021 14:28:59 -0000	1.4.2.8
@@ -16,6 +16,12 @@
       lc_time_fmt
       lc_time_utc_to_local
       lc_time_local_to_utc
+      lc_clock_to_ansi
+      lc_time_conn_to_system
+      lc_time_system_to_conn
+      lc_time_tz_convert
+      lang::system::set_timezone
+      lang::conn::timezone
 
       lang::catalog::import
       lang::catalog::import
@@ -88,6 +94,29 @@
 
     set time [lc_time_fmt $short_timestamp "%c" it_IT]
     aa_equals "format it_IT time" [lrange $time 0 end-1] "Lun 16 Dicembre 2019 12:11"
+
+    set time [lc_clock_to_ansi 1613657099]
+    aa_equals "lc_clock_to_ansi" $time "2021-02-18 15:04:59"
+
+    set time [lc_time_tz_convert -from Europe/Vienna -to Europe/Vienna -time_value "2021-02-18 15:04:59"]
+    aa_equals "lc_time_tz_convert form and to Europe/Vienna" $time "2021-02-18 15:04:59"
+
+    set time [lc_time_tz_convert -from Europe/Vienna -to America/New_York -time_value "2021-02-18 15:04:59"]
+    aa_equals "lc_time_tz_convert form and to Europe/Vienna" $time "2021-02-18 09:04:59"
+
+    #
+    # There is no easy way to change the conn::timezone. So set the
+    # system timezone to the lang::conn::timezone to get a
+    # reproducable result. Since we are running in a transaction, no
+    # harm is done.
+    #
+    lang::system::set_timezone [lang::conn::timezone]
+    set time [lc_time_conn_to_system "2021-02-18 15:04:59"]
+    aa_equals "lc_time_conn_to_system" $time "2021-02-18 15:04:59"
+
+    set time [lc_time_system_to_conn "2021-02-18 15:04:59"]
+    aa_equals "lc_time_system_to_conn" $time "2021-02-18 15:04:59"
+
   }
 }