Hello Shimon,
Could you please clarify: do you want to append it to sheet name? Or file name? Because the subject mentions "Excel sheet" but you wrote "date and time appended to the file"...
For file name there is the datetime suffix in the drop down of "Select to file" activity and for the sheet name you can click on the "Advanced properties" button located below the drop down and there you can check the option to add a timestamp. So when you are asking about AM/PM specifically i assume you know about these options and that the 24h format does not work for you - could you please confirm this?
Martin
