JavaScript - Converting a Date() into seconds

Question

I'm using the Hacker News API made at Algolia here:

https://hn.algolia.com/api

I'm a bit confused as it says to search for posts since a certain time it says to run the following query:

Comments since timestamp X (in second) http://hn.algolia.com/api/v1/search_by_date?tags=comment&numericFilters=created_at_i>X

It says to replace X with a timestamp in seconds, but how exactly would you do this? Let's say the last post I have is at 2015-08-25T15:35:58.000Z. How exactly would I run this query to search for posts since that date? I don't know how to convert this date to seconds...

score 87 · Accepted Answer · answered Aug 25 '15 at 15:50

87

getTime() will get the date in milliseconds, so divide by 1000:

var date = new Date("2015-08-25T15:35:58.000Z");
var seconds = date.getTime() / 1000; //1440516958

answered Aug 25 '15 at 15:50

tymeJV

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in some cases, you may want to add rounding. `Math.round(...)` – bvdb Aug 06 '20 at 14:23
@IonicMan, welcome to SO. What did you `try`, what did you `expect`? – Timo Apr 06 '21 at 07:16
`Math.round(Date.now() / 1000)` - shorter and about twice as performant – Simon Tong Sep 30 '22 at 00:10

JavaScript - Converting a Date() into seconds

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