public void UpdateDate()
{
textBlock_CurrentDate.Text = date.ToString("d");
bank._date = date;
// check persents status
foreach (var item in bank)
{
DepositAccount dep = item as DepositAccount;
if (dep != null)
{
dep.Calculate(date);
}
}
if (currentAccountId != -1)
{
UpdateAccountInfoUI(bank.FindAccount(currentAccountId));
}
}