/proc/ftime(File, IsCreationTime)
Arguments:
File: The path to the entry on the file system to test.
IsCreationTime = 0: 1 return the creation date; 0 for last modified date
Returns:
num: Date expressed as number of deciseconds since Jan 1, 2000.

This value can be formatted using time2text().

var/time = ftime("environment.dme") // 7.76174e+09
world.log << time2text(time) // Mon Aug 05 12:58:22 2024