Date and mobile numbers are not showing up in my csv file exporting from PHP

Date and mobile numbers are not showing up in my csv file exporting from PHP

I am working on a PHP site where I have to export all the users from mysql
database. Everything is working well but when I open the exported csv
file, the mobile number and the date are not showing up in proper format
i.e mobile number appears as hexadecimal and the date appears as #####.I
want to it in a proper data format any help ? thanks in advance