In the code that follows, change % to %% for use in batch file, for %~ta syntax enter call /?
for %a in (MyFile.txt) do set FileDate=%~ta
Sample output:
for %a in (MyFile.txt) do set FileDate=%~ta
set FileDate=05/05/2020 09:47 AM
for %a in (file_not_exist_file.txt) do set FileDate=%~ta
set FileDate=