PHP跨时区(UTC时间)应用解决方案

1.将程序内部时区设置为UTC时间.(UTC 也可以叫 GMT)
PHP设置:
date_default_timezone_set("UTC");
Yii设置:
config/main.php 中添加 :'timeZone'=>'UTC',
如此设置后,PHP生成的时间基本都是UTC时间了.例如:
//输出当前UTC时间
date("Y-m-d H:i:s");

2.数据库中存储UTC时间.
可以用PHP控制,也可以通过设置数据库时区来实现.

3.服务端发送到前端的时间均为UTC时间格式, 由JS将其转换为本地时间后进行显示.JS内部数据与显示数据分离.
JS转换函数参考:

/** 
* 将UTC时间转为本地时间 
* @param string utcTime utc时间字符串 格式 :'Y-m-d H:i:s' 
* @return string 本地时间字符串 格式 :'Y-m-d H:i:s' 
*/ 
function utcToLocal(utcTime) { 
if(utcTime==='0000-00-00 00:00:00' || utcTime===null || utcTime==='' || utcTime===undefined) 
return utcTime; 
var locTime = new Date(); //local时间对象 
utcTime=utcTime.replace("-", "/").replace("-", "/"); //火狐不兼容'-'分隔日期 
//解析字符串及本地时间赋值 
locTime.setTime(Date.parse(utcTime)-locTime.getTimezoneOffset()*60000); 
//本地时间字符串格式化 
var year = locTime.getFullYear(); 
var month = preZero(locTime.getMonth()+1); 
var date = preZero(locTime.getDate()); 
var hour = preZero(locTime.getHours()); 
var minute = preZero(locTime.getMinutes()); 
var second = preZero(locTime.getSeconds()); 
return year+'-'+month+'-'+date+' '+hour+':'+minute+':'+second; 
} 
/** 
* 将本地时间转为UTC时间 
* @param string locTime utc时间字符串 格式 :'Y-m-d H:i:s' 
* @return string 本地时间字符串 格式 :'Y-m-d H:i:s' 
*/ 
function localToUtc(locTime) { 
if(locTime==='0000-00-00 00:00:00' || locTime==='0000-00-00' || locTime===null || locTime==='' || locTime===undefined) 
return locTime; 
var tmpTime = new Date(); 
var utcTime = new Date(); 
locTime=locTime.replace("-", "/").replace("-", "/"); //火狐不兼容'-'分隔日期 
//解析字符串 
tmpTime.setTime(Date.parse(locTime)); 
if(locTime.length>10) { 
var year = tmpTime.getUTCFullYear(); 
var month = preZero(tmpTime.getUTCMonth()+1); 
var date = preZero(tmpTime.getUTCDate()); 
var hour = preZero(tmpTime.getUTCHours()); 
var minute = preZero(tmpTime.getUTCMinutes()); 
var second = preZero(tmpTime.getUTCSeconds()); 
return year+'-'+month+'-'+date +' '+hour+':'+minute+':'+second; 
} else { 
//设置日期,保留本地时间(供UTC转换用) 
utcTime.setFullYear(tmpTime.getFullYear()); 
utcTime.setMonth(tmpTime.getMonth());utcTime.setMonth(tmpTime.getMonth());//?若不重复,则赋值无效 
utcTime.setDate(tmpTime.getDate()); 
var year = utcTime.getUTCFullYear(); 
var month = preZero(utcTime.getUTCMonth()+1); 
var date = preZero(utcTime.getUTCDate()); 
return year+'-'+month+'-'+date; 
} 
} 
//单个数字添加前导0 
function preZero(str) { 
return str.toString().length<2 ? '0'+str : str; 
}