How do I subtract minutes from a date in javascript

Question

How can I translate this pseudo code into working js  don t worry about where the end date comes from except that it s a valid javascript date    var myEndDateTime   somedate     somedate is a valid js date   var durationInMinutes   100    this can be any number of minutes from 1-7200  5 days     this is the calculation I don t know how to do var myStartDate   somedate - durationInMuntes   alert  The event will start on     myStartDate toDateString       at     myStartDate toTimeString

User · Answer

Try as below    var dt   new Date    dt setMinutes  dt getMinutes   - 20    console log         dt

User · Answer

You can also use get and set minutes to achieve it   var endDate   somedate   var startdate   new Date endDate    var durationInMinutes   20   startdate setMinutes endDate getMinutes   - durationInMinutes

User · Answer

This is what I found     First  start with a particular time var date   new Date       Add two hours var dd   date setHours date getHours     2      Go back 3 days var dd   date setDate date getDate   - 3      One minute ago    var dd   date setMinutes date getMinutes   - 1      Display the date  var monthNames     January    February    March    April    May    June    July    August    September    October    November    December    var date   new Date dd   var day   date getDate    var monthIndex   date getMonth    var year   date getFullYear    var displayDate   monthNames monthIndex          day          year  alert  Date is now      displayDate     Sources   http   www javascriptcookbook com article Perform-date-manipulations-based-on-adding-or-subtracting-time   https   stackoverflow com a 12798270 1873386

User · Answer

Everything is just ticks  no need to memorize methods     var aMinuteAgo   new Date  Date now   - 1000   60      or  var aMinuteLess   new Date  someDate getTime   - 1000   60      update  After working with momentjs  I have to say this is an amazing library you should check out  It is true that ticks work in many cases making your code very tiny and you should try to make your code as small as possible for what you need to do  But for anything complicated  use momentjs

User · Answer

var date new Date       here I am using  -30  to subtract 30 minutes from the current time  var minute date setMinutes date getMinutes  -30     console log minute    it will print the time and date according to the above condition in Unix-timestamp format    you can convert Unix timestamp into conventional time by using new Date   for example   var extract new Date minute  console log minute   this will print the time in the readable format

User · Answer

This is what I did  see on Codepen  var somedate   1473888180593  var myStartDate    var myStartDate   somedate - durationInMuntes   myStartDate   new Date dateAfterSubtracted  minutes   100     alert  The event will start on     myStartDate toDateString       at     myStartDate toTimeString      function dateAfterSubtracted range  amount       var now   new Date        if range      years            return now setDate now getYear   - amount             if range      months            return now setDate now getMonth   - amount             if range      days            return now setDate now getDate   - amount             if range      hours            return now setDate now getHours   - amount             if range      minutes            return now setDate now getMinutes   - amount             else           return null

User · Answer

moment js has some really nice convenience methods to manipulate date objects  The  subtract method  allows you to subtract a certain amount of time units from a date  by providing the amount and a timeunit string   var now   new Date       Sun Jan 22 2017 17 12 18 GMT 0200     var olderDate   moment now  subtract 3   minutes   toDate       Sun Jan 22 2017 17 09 18 GMT 0200

User · Answer

Extend Date class with this function     Add  or substract if value is negative  the value  expresed in timeUnit    to the date and return the new date  Date dateAdd   function currentDate  value  timeUnit         timeUnit   timeUnit toLowerCase        var multiplyBy     w 604800000                       d 86400000                       h 3600000                       m 60000                       s 1000        var updatedDate   new Date currentDate getTime     multiplyBy timeUnit    value        return updatedDate       So you can add or substract a number of minutes  seconds  hours  days    to any date   add 10 minutes to current date   Date dateAdd  Date    10   m    subs 1 hour to a date   Date dateAdd  date value  -1   h

User · Answer

Once you know this    You can create a Date by calling the constructor with milliseconds since Jan 1  1970  The valueOf   a Date is the number of milliseconds since Jan 1  1970 There are 60 000 milliseconds in a minute  -       it isn t so hard   In the code below  a new Date is created by subtracting the appropriate number of milliseconds from myEndDateTime   var MS PER MINUTE   60000  var myStartDate   new Date myEndDateTime - durationInMinutes   MS PER MINUTE

[javascript] How do I subtract minutes from a date in javascript?

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