如何从时间范围获取当前程序

Question

Let's say that i have a JSON file like this

[
    {
        "programId": "bla-bla-1",
        "programTitle": "bla bla 1",
        "programImg": "bla1.jpg",
        "startsAt": "Apr 05 2017 11:00:00 GMT+0200 (EET)",
        "endsAt": "Apr 05 2017 12:00:00 GMT+0200 (EET)"
    },
    {
        "programId": "bla-bla-2",
        "programTitle": "bla bla 2",
        "programImg": "bla2.jpg",
        "startsAt": "Apr 05 2017 12:00:00 GMT+0200 (EET)",
        "endsAt": "Apr 05 2017 14:00:00 GMT+0200 (EET)"
    },
    {
        "programId": "bla-bla-3",
        "programTitle": "bla bla 3",
        "programImg": "bla3.jpg",
        "startsAt": "Apr 05 2017 14:00:00 GMT+0200 (EET)",
        "endsAt": "Apr 05 2017 16:00:00 GMT+0200 (EET)"
    }
]

And current time is (Apr 05 2017 12:30:00 GMT+0200 (EET)) how can i get the current program from those time ranges using Javascript also i can use library like momentJS

Answer 1

You can do something like this:

 var obj = [ { "programId": "bla-bla-1", "programTitle": "bla bla 1", "programImg": "bla1.jpg", "startsAt": "Apr 05 2017 11:00:00 GMT+0200 (EET)", "endsAt": "Apr 05 2017 12:00:00 GMT+0200 (EET)" }, { "programId": "bla-bla-2", "programTitle": "bla bla 2", "programImg": "bla2.jpg", "startsAt": "Apr 05 2017 12:00:00 GMT+0200 (EET)", "endsAt": "Apr 05 2017 14:00:00 GMT+0200 (EET)" }, {"programId": "bla-bla-3", "programTitle": "bla bla 3", "programImg": "bla3.jpg", "startsAt": "Apr 05 2017 14:00:00 GMT+0200 (EET)", "endsAt": "Apr 05 2017 16:00:00 GMT+0200 (EET)"}]; var now = new Date("Apr 05 2017 12:30:00 GMT+0200 (EET)").getTime();//new Date().getTime(); var prog = obj.find(o => { return (now >= new Date(o.startsAt).getTime() && now <= new Date(o.endsAt).getTime()); }); console.log(prog); 

Answer 2

Note that the solution given by Tisus may not work on every browser since date parsing of non-standard string is system-dependent.

I suggest to parse your input using moment(String, String) instead of new Date(String) . Then you can use moment isBetween to check if the current day is in the given range.

Here a live sample:

 var input = [ { "programId": "bla-bla-1", "programTitle": "bla bla 1", "programImg": "bla1.jpg", "startsAt": "Apr 05 2017 11:00:00 GMT+0200 (EET)", "endsAt": "Apr 05 2017 12:00:00 GMT+0200 (EET)" }, { "programId": "bla-bla-2", "programTitle": "bla bla 2", "programImg": "bla2.jpg", "startsAt": "Apr 05 2017 12:00:00 GMT+0200 (EET)", "endsAt": "Apr 05 2017 14:00:00 GMT+0200 (EET)" }, { "programId": "bla-bla-3", "programTitle": "bla bla 3", "programImg": "bla3.jpg", "startsAt": "Apr 05 2017 14:00:00 GMT+0200 (EET)", "endsAt": "Apr 05 2017 16:00:00 GMT+0200 (EET)" } ] var prog = input.find(item => { //var now = moment(); // mocking current time in order to get always the same result var now = moment("Apr 05 2017 12:30:00 GMT+0200 (EET)", 'MMM DD YYYY HH:mm:ss Z') var start = moment(item.startsAt, 'MMM DD YYYY HH:mm:ss Z'); var end = moment(item.endsAt, 'MMM DD YYYY HH:mm:ss Z'); return now.isBetween(start, end); }); console.log(prog); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script> 

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As side note: I agree with Rajesh, providing code attempt would help getting better answers and gives you the chance to learn better.