Format date and time for linelog

I have to output the current date and time via linelog on a specific way. *DD/MM/YYY,HH:MM:SS* I've figured out all of the fields but the seconds one. There's no seconds expansion on the documentation: https://wiki.freeradius.org/config/run_time_variables I was wondering if there's any alternative way, since I've seen there's a %S variable that outputs almost what I want: Except, it uses dash instead of forward slash for date separation and that it outputs both date and time separated by a space, while I have to use a comma between those two, since they are going on different fields. Is there a way to manipulate (substitute) characters? or a better way of achieving this? Regards.