I've come across a snippet of code that I'm trying to decipher. It's used to set a cookie with an expiry date, and it looks something like this.
var date = new Date();
date.setTime(date.getTime() + 1000*60*60*24*365);
var expires = "; expires=" + date.toGMTString();
My goal is to understand what each number in the code represents. While I know that it involves adding milliseconds to the time object, breaking down the significance of each numeric value is where I'm currently stuck.
There are 1000 milliseconds in a second
60 seconds in a minute
60 minutes in an hour
24 hours in a day
365 days in a year
By multiplying these values together, you can calculate the total number of milliseconds in a year.
let currentDate = new Date(); // creating a date object for the current time
currentDate.setTime( // updating the time
currentDate.getTime() // representing now in milliseconds since 1970
+ 1000 // adding milliseconds in a second
* 60 // multiplying to get seconds in a minute
* 60 // getting minutes in an hour
* 24 // calculating hours in a day
* 365 // approximating days in a year. The total is the number of milliseconds in a year
);
const expirationDate = "; expires=" +
currentDate.toGMTString(); // formatting the time as required for cookies
Please refer to:
for further details and explanations.
If you take 1000 milliseconds and multiply it by 60 seconds, then by 60 minutes, followed by 24 hours, and finally by 365 days, you will get the equivalent of a year.
Consider this perspective:
1000*60*60*24*365
1000 // Changing milliseconds to seconds
60 // Converting seconds to minutes
60 // Transforming minutes to hours
24 // Converting hours to days
365 // Changing days to years
There are 1000 milliseconds in a second, 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 365 days in a year,
This totals the number of milliseconds in a year, essentially fast-forwarding time by one year
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