setTimeout

// Using normal functions
void func() { writeln("Timer end"); }
import std.functional: toDelegate;
setTimeout(toDelegate(&func), 6000);

// Using inline delegates
setTimeout(delegate void() { writeln("Timer end"); }, 6000);

// Interval
setInterval(delegate void() { writeln("Timer tick"); }, 10);

// Stop timer
// After stopping timer it cannot be restarted
AsyncTimer timer = setInterval(delegate void() { writeln("Timer tick"); }, 10);
timer.stop();

// Adjusting timer values
// Will be adjusted on next cycle (aka after 10 msec)
timer = setInterval(delegate void() { writeln("Timer tick"); }, 10);
timer.timespan = 50;
timer.interval = false; // will prevent timer from running next cycle