void CheckWorkTime()
{
var now = DateTime.Now;
if (now < dismissUntil)
{
return;
}
var begin = workTime.GetWorkBegin(now);
if (begin == null)
{
return;
}
var mustGo = begin.Value + Contract.MaxWorkTimePerDay;
var warn = new TimeInterval(mustGo - warnBefore, mustGo + warnAfter);
if (warn.Contains(now))
{
ShowWorkTimeAlert();
}
}