import std.datetime : abs, SysTime;

scope(exit) deleteme.remove;
write(deleteme, "a");

SysTime accessTime, modificationTime;

getTimes(deleteme, accessTime, modificationTime);

import std.datetime : Clock, seconds;
auto currTime = Clock.currTime();
enum leeway = 5.seconds;

auto diffAccess = accessTime - currTime;
auto diffModification = modificationTime - currTime;
assert(abs(diffAccess) <= leeway);
assert(abs(diffModification) <= leeway);