Merge pull request #169 from CartoDB/2202-DateToNumber-with-time-zones

Changes CDB_DateToNumber() to accept timestamps with time zones 2202

scripts-available/CDB_DateToNumber.sql

@@ -13,3 +13,19 @@ RETURN output;
 END;
 $$
 LANGUAGE 'plpgsql' STABLE STRICT;
+
+-- Convert timestamp with time zone to double precision
+--
+CREATE OR REPLACE FUNCTION CDB_DateToNumber(input timestamp with time zone)
+RETURNS double precision AS $$
+DECLARE output double precision;
+BEGIN
+    BEGIN
+        SELECT extract (EPOCH FROM input) INTO output;
+    EXCEPTION WHEN OTHERS THEN
+        RETURN NULL;
+    END;
+RETURN output;
+END;
+$$
+LANGUAGE 'plpgsql' STABLE STRICT;

test/CDB_DateToNumberTest.sql

@@ -0,0 +1,2 @@
+SELECT * FROM CDB_DateToNumber('1999-01-08 00:00:00'::timestamp);
+SELECT * FROM CDB_DateToNumber('1999-01-08 00:00:00+05'::timestamp with time zone);

test/CDB_DateToNumberTest_expect

@@ -0,0 +1,2 @@
+915753600
+915735600