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Manolait
Asked: 2020-02-12 05:50:06 +0800 CST 2020-02-12 05:50:06 +0800 CST

Subtract a number of hours from the current date in moment.js

  • 772

I am using the moment.js library, in nodejs and javascript and I need in two fields "Start_Date" and "End_Date" that the start_date is always 2 hours before the current date, but on point and the end_date will be one hour before the current but on point.

I give an example:

Fecha_Actual: 2019-02-11T14:36
Fecha_Inicio: 2019-02-11T12:00
Fecha_Fin:    2019-02-11T13:00

At this time I collect the information in such a way: 

var fechaInicio = moment().format('YYYY-MM-DDTHH:mm');

I've tried some documentation options of this style as mentioned (changing the day for hour but it doesn't work as I need)

moment().day(-7); // last Sunday (0 - 7)

Any help is good.

Greetings and thank you.

javascript

1 Answers

  1. Best Answer

    MomentJS has a subtract function that is responsible for subtracting seconds, hours, days, etc.

    Now, since you want to set the hours and subtract the minutes - if they exist - you must do something like this

    const getTime = () => {
  const date = moment().subtract(2, 'hours')
  const minute = date.minutes()
  
  alert(date.subtract(minute, 'minutes').format('YYYY-MM-DDTHH:mm'))
}
    <link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>

<div class="container mt-5">
  <button type="button" class="btn btn-primary" onclick="getTime()">Obtener fecha</button>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>

    In short, we get the current date and subtract two hours from it, leaving the format provided by momentjs by default, since if you try to subtract the minutes from a date with a different format, it won't work . Finally, once you make the necessary subtractions you can give the formatone you want to your date.

    Let us know how it goes for you :)

    • 2