Customization / App Development Help

Hi Guys,
1.How To Default a Date As Today Date?( Example:sales Invoice)
2.How ll Amount is Calculate Automatically After We give The Discount Amount and Like Grand Total,In Words… ?(ex:Sales Invoice)
3.How ll Total Hour Is displayed Automatiically??(Ex:Time Log)

Please Give The Inforamtion Correctly And Clearly

  1. Default date is set using the default property in the DocType
  2. Calculations are done on server side using controllers

See examples:

If you are using Custom fields you can just enter the word “Today” into the default field.