I need to analyze some JSON data
This is the specific snippet required for my query.
"UpdatedDate":"\/Date(1311377875937)\/"
I'm unsure about that number, but the updated date indicates when the item was last modified
Moreover, how can I determine if it was last updated 20 seconds ago or less?
The value represents a DateTime, measured in milliseconds, starting from the year 1970. By dividing the two DateTimes by 1000 and calculating the difference, you can find the result in seconds.
let secondsDiff = (new Date() - UpdateDate) / 1000;
Some encoding methods, whether automated or manual, choose to store dates in a format that uses a Unix timestamp to indicate when the data was last updated.
To extract a Date object from this format, you will need to extract the numerical values from the string and pass them into the Date() constructor.
var dateStr = obj.UpdatedDate;
var dateInfo = dateStr.match(/\/Date\((\d+)\)\//);
var update = new Date(parseInt(dateInfo[1], 10));
If you want to check if the update occurred within the past 20 seconds, simply calculate the difference between this date object and a new one representing the current time.
var diff = Date.now() - update; // The result is in milliseconds
var diffSec = diff/1000; // Convert it to seconds
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