Javascript Date.toJSON没有得到时区偏移 [英] Javascript Date.toJSON don't get the timezone offset
问题描述
new Date()。toJSON()。slice 0,10)
将我的日期作为 YYYY-MM-DD
string,那么我在某些mysql查询和某些条件语句中使用它像参数。一天结束,我还没有得到正确的日期,因为它还在前一天(我的时区偏移是+2/3小时)。
我没有注意到 toJSON
方法没有考虑到您的时区偏移量,所以我已经结束了这个hacky解决方案:
var today = new Date();
today.setHours(today.getHours()+(today.getTimezoneOffset()/ - 60));
console.log(today.toJSON()。slice(0,10));
有更优雅的解决方案吗?
- 以下是测试代码: http://jsfiddle.net/simo/qwhYw/
- JavaScript toJSON()方法: http: //www.w3schools.com/jsref/jsref_tojson.asp - 您可以在这里看到错误的时间
- JavaScript日期对象: http://www.w3schools.com/jsref/jsref_obj_date.asp
ECMAScript中的日期对象是内部UTC。时区偏移量用于本地时间。
Date.prototype.toJSON 的规范说它使用 Date.prototype.toISOString ,其中指出时区总是UTC。您的解决方案是通过时区偏移来抵消日期对象的UTC时间值。
考虑将自己的方法添加到Date.prototype,例如
Date.prototype.toJSONLocal = function(){
function addZ(n){
return(n <10? '0':'')+ n;
}
返回this.getFullYear()+' - '+
addZ(this.getMonth()+ 1)+' - '+
addZ(this.getDate );
}
修改
如果你想挤压额外的性能,以下应该更快:
Date.prototype.toJSONLocal =(function(){
函数addZ(n){
return(n< 10?'0':'')+ n;
}
return function(){
return this。 getFullYear()+' - '+
addZ(this.getMonth()+ 1)+' - '+
addZ(this.getDate());
};
}())
但是,过早的优化,所以除非你打电话给数千次很短的时间,我不会打扰。
Well the problem is that I was using code like this:
new Date().toJSON().slice(0, 10)
to get my date as YYYY-MM-DD
string, then I use it like parameter in some mysql queries and in some condition statements. In the end of the day I wasn't getting the right date since it was still in the previous day (my timezone offset is +2/3 hours).
I haven't noticed that the toJSON
method does not take into account your timezone offset, so I've ended up with this hacky solution:
var today = new Date();
today.setHours( today.getHours()+(today.getTimezoneOffset()/-60) );
console.log(today.toJSON().slice(0, 10));
Is there a more elegant solution?
- Here is the test code: http://jsfiddle.net/simo/qwhYw/
- JavaScript toJSON() Method: http://www.w3schools.com/jsref/jsref_tojson.asp - you can see the wrong time here
- JavaScript Date Object: http://www.w3schools.com/jsref/jsref_obj_date.asp
Date objects in ECMAScript are internally UTC. The timezone offset is used for local times.
The specification for Date.prototype.toJSON says that it uses Date.prototype.toISOString, which states that "the timezone is always UTC". What your solution is doing is offsetting the UTC time value of the date object by the timezone offset.
Consider adding your own method to Date.prototype, e.g.
Date.prototype.toJSONLocal = function() {
function addZ(n) {
return (n<10? '0' : '') + n;
}
return this.getFullYear() + '-' +
addZ(this.getMonth() + 1) + '-' +
addZ(this.getDate());
}
Edit
If you want to squeeze extra performance, the following should be faster:
Date.prototype.toJSONLocal = (function() {
function addZ(n) {
return (n<10? '0' : '') + n;
}
return function() {
return this.getFullYear() + '-' +
addZ(this.getMonth() + 1) + '-' +
addZ(this.getDate());
};
}())
But that smacks of premature optimisation, so unless you are calling it thousands of times in a very short period, I wouldn't bother.
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