略微加速

$smarty = new Smarty; 
$smarty->assign('yesterday', strtotime('-1 day')); 
$smarty->display('index.tpl'); 
index.tpl: 
{$smarty.now|date_format} 
{$smarty.now|date_format:"%A, %B %e, %Y"} 
{$smarty.now|date_format:"%H:%M:%S"} 
{$yesterday|date_format} 
{$yesterday|date_format:"%A, %B %e, %Y"} 
{$yesterday|date_format:"%H:%M:%S"}

输出代码如下:
Feb 6, 2001 
Tuesday, February 6, 2001 
:33:00 
Feb 5, 2001 
Monday, February 5, 2001 
:33:00 

常用格式：{$smarty.now|date_format:"%Y-%m-%d %H:%M:%S"}   显示2010-05-16 05:20:14

更多请参看smarty手册，下面只作简单几个介绍。。

%a - abbreviated weekday name according to the current locale 
（根据当地格式输出“星期”缩写格式） 
%A - full weekday name according to the current locale 
（根据当地格式输出“星期”全称格式） 
%b - abbreviated month name according to the current locale 
（根据当地格式输出“月”缩写格式） 
%B - full month name according to the current locale 
（根据当地格式输出“月”全称格式）