End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
class method
File.mtime
File.mtime(file_name) → time
file.c
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static VALUE
rb_file_s_mtime(VALUE klass, VALUE fname)
{
struct stat st;
if (rb_stat(fname, &st) < 0) {
int e = errno;
FilePathValue(fname);
rb_syserr_fail_path(e, fname);
}
return stat_mtime(&st);
}