javascript 比较javascript中的时间戳
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compare timestamps in javascript
提问by Sredny M Casanova
I have a date saved in a string with this format: 2017-09-28T22:59:02.448804522Zthis value is provided by a backend service.
我有一个以这种格式保存在字符串中的日期：2017-09-28T22:59:02.448804522Z该值由后端服务提供。
Now, in javascript how can I compare if that timestamp is greater than the current timestamp? I mean, I need to know if that time happened or not yet taking in count the hours and minutes, not only the date.
现在，在 javascript 中如何比较时间戳是否大于当前时间戳？我的意思是，我需要知道那个时间是否已经发生或尚未计算小时和分钟，而不仅仅是日期。
回答by nicooga
You can parse it to create an instance of Dateand use the built-in comparators:
您可以解析它以创建一个实例Date并使用内置比较器：
new Date('2017-09-28T22:59:02.448804522Z') > new Date()
// true
new Date('2017-09-28T22:59:02.448804522Z') < new Date()
// false
回答by agm1984
You could also convert it to unix time in milliseconds:
您还可以将其转换为以毫秒为单位的 unix 时间：
console.log(new Date('2017-09-28T22:59:02.448804522Z').valueOf())
const currentTime = new Date('2017-09-28T22:59:02.448804522Z').valueOf()
const expiryTime = new Date('2017-09-29T22:59:02.448804522Z').valueOf()
if (currentTime < expiryTime) {
console.log('not expired')
}回答by selmansamet
const anyTime = new Date("2017-09-28T22:59:02.448804522Z").getTime();
const currentTime = new Date().getTime();
if(currentTime > anyTime){
//codes
}
回答by TinkerTenorSoftwareGuy
If you can, I would use moment.js * https://momentjs.com/
如果可以，我会使用 moment.js * https://momentjs.com/
You can create a moment, specifying the exact format of your string, such as:
您可以创建一个时刻，指定字符串的确切格式，例如：
var saveDate = moment("2010-01-01T05:06:07", moment.ISO_8601);
Then, if you want to know if the saveDateis in the past:
然后，如果您想知道saveDate过去是否为：
boolean isPast = (now.diff(saveDate) > 0);
boolean isPast = (now.diff(saveDate) > 0);
If you can't include an external library, you will have to string parse out the year, day, month, hours, etc - then do the math manually to convert to milliseconds. Then using Date object, you can get the milliseconds:
如果您不能包含外部库，则必须将年、日、月、小时等字符串解析出来 - 然后手动进行数学运算以转换为毫秒。然后使用 Date 对象，您可以获得毫秒：
var d = new Date();
var currentMilliseconds = d.getMilliseconds();
At that point you can compare your milliseconds to the currentMilliseconds. If currenMilliseconds is greater, then the saveDate was in the past.
此时，您可以将毫秒数与当前毫秒数进行比较。如果currenMilliseconds 更大，那么saveDate 是过去的。
