setDate() of the
Date object to subtract a day from it.
It’s quite easy to implement; You can do it in four steps:
- Get the current date by
- Get the day of the month via
- Subtract 1 day from it
Date.prototype.setDate()to set the result as the day of the month
Let’s write the code:
let currentDate = new Date() // Instantiate another object (based on the current), so we won't mutate the currentDate object let yesterday = new Date(currentDate) yesterday.setDate(yesterday.getDate() - 1) console.log(yesterday)
In the above example, we get the current date (today in this case). Then, we instantiate another date object to avoid mutating the
getDate() method returns the day of the month for our date object. The return value is an integer number between
Next, we subtract 1 from the value returned by
getDate() and update the object by the
If the result is outside the acceptable range for the respective month,
setDate() will update the
Date object accordingly (by changing it to the next or previous month respectively).
For instance, if we're on the first day of the month, and we subtract a day, the result would be the last day of the previous month - instead of 0.
How do I get yesterday's timestamp?
To get the yesterday's date in Unix Timestamp, first you need to call
Date.prototype.valueOf() on your
Date object. And since the returned value is in milliseconds, you'll have to divide it by
let currentDate = new Date() // Instantiate another object (based on the current), so we won't mutate the currentDate object let yesterday = new Date(currentDate) yesterday.setDate(yesterday.getDate() - 1) console.log(Math.floor(yesterday.valueOf() / 1000))
It's important to return only elapsed seconds as an integer value; That's why we used
Math.floor(), and not
Thanks for reading.
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