How to get file's last modified date on Windows command line?

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=

You can do it

forfiles /M myfile.txt /C "cmd /c echo @fdate @ftime"

Useful reference to get file properties using a batch file, included is the last modified time:

FOR %%? IN ("C:\somefile\path\file.txt") DO (
    ECHO File Name Only       : %%~n?
    ECHO File Extension       : %%~x?
    ECHO Name in 8.3 notation : %%~sn?
    ECHO File Attributes      : %%~a?
    ECHO Located on Drive     : %%~d?
    ECHO File Size            : %%~z?
    ECHO Last-Modified Date   : %%~t?
    ECHO Drive and Path       : %%~dp?
    ECHO Drive                : %%~d?
    ECHO Fully Qualified Path : %%~f?
    ECHO FQP in 8.3 notation  : %%~sf?
    ECHO Location in the PATH : %%~dp$PATH:?
)