/*******************************************************************
        * 							  *********
       **  Sir Drink a lots Timerem                      v 2.0    ******** 
      ***                                                         ******* 
     ****  INFO:  Announces automatically the time remaining      ****** 
    *****  before mapchange.It uses Game_Commencing for starting  ***** 
   ******  timer and checks every second the cvar mp_timelimit,	  **** 
  *******  to display the correct time. 			  *** 
 ********  Thanks to Warhead,Black Knight,Schnuffer and the       **
*********  www.adminmod.de forumusers for help	and the idea	  *
******************************************************************/ 

It uses the systemtime to get an exact time. Sometimes it works only after first mapchange.