Generate Random String

 DateTime currentDate = DateTime.now();

String randstring = currentDate.format('ddMMHHmmss');

Integer randomNumberToAppend = null;

while(true){

    randomNumberToAppend = Integer.valueOf(Math.random()*10000);

    if(String.valueOf(randomNumberToAppend).length()==4){

        break;

    }

}

randstring += randomNumberToAppend;


System.debug('randstring@@@'+randstring);

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