Description: ExecStart=/usr/bin/ffmpeg -f v4l2 -s 640x480 -i /dev/video0 /home/joefri85/test-"$(date +'%A')".mpg in a service should output a file named test-Sunday.mpg if the day is Sunday but instead it outputs the file test-$(date +'%A').mpg

ffmpeg -f v4l2 -s 640x480 -i /dev/video0 /home/joefri85/test-"$(date +'%A')".mpg outputs a file with the name test-Sunday.mpg


I am trying to run this service at a specific time each day with a systemd timer and name it the day of the week so I can have a full week's worth of video feeds to look back on. systemd does not recognize the syntax that can be normally used in every other situation I have tried. This seems to be a conflict with systemd

Additional info:
* package version(s)
* config and/or log files etc.
this is a service file in /etc/systemd/system named ffmpegd.service

[Unit]
## Displays a description of the service
Description=ffmpeg

## When the service is triggered
After=network.target

[Service]
## Type can be simple, forking (background?), oneshot, notify, dbus, idle
Type=simple

## Runs the service as this user
User=joefri85

## start command
ExecStart=/usr/bin/ffmpeg -f v4l2 -s 640x480 -i /dev/video0 /home/joefri85/"$(date +'%A')".mpg


Steps to reproduce:
create the above service file and run "sudo systemctl start ffmpegd"