you can do this multiple types
assume that this is your String
NSString *origialString =@"00:03:45";
Type-1
NSArray *getBalance = [origialString componentsSeparatedByString: @":"];
origialString = [NSString stringWithFormat:@"%@:%@", [getBalance objectAtIndex:1], [getBalance objectAtIndex:2]];
Type-2
origialString = [origialString substringFromIndex:3];
Type-3
origialString = [origialString substringWithRange:NSMakeRange(3, [origialString length]-3)];
Type-4
// Use NSDateformatter but not necessary for here
solved How to spliit a NSString in iOS [duplicate]