Has been planted :
Use that logevent and store the gametime into a global var:
register_logevent("LogEvent_PlantedTheBomb", 3, "2=Planted_The_Bomb")
Gonna explode :
cs_get_c4_explode_time( c4_entity_index )
Remaining time before explosion :
get_gametime() - cs_get_c4_explode_time( c4_entity_index )
http://forums.alliedmods.net/showthread.php?t=40164
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