Efficiently create Javascript Date from Today -1 Years (time) in Unix time

Question

I currently am using this to create a Unix time stamp for time (now) -1 year's time.

Can someone please share a better and more efficient way to do this?

var currentDate = new Date();
var currentYear = currentDate.getFullYear();
var lastYear = parseInt(currentYear) - 1;
var lastYearDateObj = new Date(lastYear, currentDate.getMonth(), currentDate.getDate(), currentDate.getHours(), currentDate.getMinutes());
var lastYearTime = lastYearDateObj.getTime() / 1000;

Thank you!

possible duplicate of find out the previous year date from current date in javascript — Felix Kling
– Felix Kling, Commented Apr 9, 2014 at 0:48

Scott Sauyet · Accepted Answer · 2014-04-09 00:45:08Z

2

I don't understand what your division by 1000 is about. You can add it to the end if you like:

var date = new Date();
date.setFullYear(date.getFullYear() - 1);
// date.getTime() / 1000 // if you want.

answered Apr 9, 2014 at 0:45

Scott Sauyet

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4 Comments

Felix Kling Over a year ago

getTime returns milliseconds, so dividing by 1000 gives seconds (unix time in seconds).

Scott Sauyet Over a year ago

I've always used timestamps in milliseconds (or microseconds in some systems), not just seconds. That's why I didn't understand. Is there some Unix timestamp in seconds?

Felix Kling Over a year ago

"Unix time, or POSIX time, is a system for describing instants in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970,[note 1] not counting leap seconds." en.wikipedia.org/wiki/Unix_time

Scott Sauyet Over a year ago

Thanks. Just looking at that. Strange that I've always used milli- or micro-second timestamps from other systems.

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