AM2431: The file's last modification time is not updated.

Part Number: AM2431


I am currently using mcu_plus_sdk_am243x_08_03_00_18 (and it might not be possible to upgrade to a new version at the moment).
While using FREERTOS+FAT, I noticed that after editing file content, the file's last modification time is not updated.
I have already set ffconfigTIME_SUPPORT to 1. 
I would like to confirm, if updating the modification time is necessary, what other settings are required?