From https://gist.github.com/1734181

gistfile1.opa

diff --git a/opabsl/jsbsl/bslTime.js b/opabsl/jsbsl/bslTime.js
index c7cee7d..207ef7a 100644
--- a/opabsl/jsbsl/bslTime.js
+++ b/opabsl/jsbsl/bslTime.js
@@ -159,10 +159,10 @@ function now()
     return t.getHours();
 }
 
-##register local_timezone_offset : time_t -> int
-    ##args(f)
+##register local_timezone_offset : -> int
+    ##args()
 {
-    var t = new Date(); t.setTime(f)
+    var t = new Date();
     return t.getTimezoneOffset();
 }
 
diff --git a/opabsl/mlbsl/bslTime.ml b/opabsl/mlbsl/bslTime.ml
index afb740b..cba3b96 100644
--- a/opabsl/mlbsl/bslTime.ml
+++ b/opabsl/mlbsl/bslTime.ml
@@ -83,7 +83,7 @@
    ##register local_hour : time_t -> int
    let local_hour t = Time.local_hour (wrap t)
 
-   ##register local_timezone_offset : time_t -> int
+   ##register local_timezone_offset : -> int
    let local_timezone_offset _ = Time.local_timezone_offset()
 
    ##register local_mday : time_t -> int
diff --git a/stdlib/core/date/date.opa b/stdlib/core/date/date.opa
index 7c5a021..492e0d0 100644
--- a/stdlib/core/date/date.opa
+++ b/stdlib/core/date/date.opa
@@ -432,8 +432,7 @@ type time_t = external
    * @return The local timezone (+hhmm or -hhmm).
   **/
   get_local_timezone : -> string = -> (
-    t : Date.date = Date.now()
-    delta : int = Date_private.time_local_timezone_offset(t)
+    delta : int = Date_private.time_local_timezone_offset()
     // delta is the timezone in minutes, so we need to convert it into
     // +hhmm or -hhmm. If delta is positive, the timezone is -hhmm. Otherwise
     // the timezone is +hhmm.
diff --git a/stdlib/core/date/date_private.opa b/stdlib/core/date/date_private.opa
index 05fc865..f390aae 100644
--- a/stdlib/core/date/date_private.opa
+++ b/stdlib/core/date/date_private.opa
@@ -105,8 +105,8 @@ import stdlib.core.parser
   time_local_hour : Date.date -> int =
     date_in(%%BslTime.local_hour%% : time_t -> int)   // Hours 0..23
 
-  time_local_timezone_offset : Date.date -> int =
-    date_in(%%BslTime.local_timezone_offset%% : time_t -> int)
+  time_local_timezone_offset : -> int =
+    %%BslTime.local_timezone_offset%% : -> int
 
   time_local_mday : Date.date -> int =
     date_in(%%BslTime.local_mday%% : time_t -> int)   // Day of month 1..31