Javascript code for showing yesterday s date and todays date

Question

How to show yesterday s date in my  textbox the yesterday s date and at the same time  the today s date in    I have this home php where I show the date yesterday user cannot modify this-readonly  and the date today user MUST input the date today   And when tomorrow comes and the user visits the home  php s he will saw the date inputted yesterday  and will input the date again for romorrow s   E G  Day1  march 30  2011  Yesterday s date  March 29  2011   Not editable textbox   Enter date today   I ll type    March 30  2011   Day 2  march 31  2011  Yesterday s date  March 30  2011   Not editable textbox  Automatically  this will appear upon hitting the home php Enter date today   I ll type    March 31  2011   and so on    I need a validation that wont accept wrong date format and the format must be  01-Mar-11 How to do this

User · Answer

Yesterday s date can be calculated as   var prev date   new Date    prev date setDate prev date getDate   - 1

User · Answer

Yesterday s date is simply today s date less one  so   var d   new Date    d setDate d getDate   - 1     If today is 1 April  then it is set to 0 April which is converted to 31 March   Since you also wanted to do some other stuff  here are some functions to do it      Check if d is a valid date    Must be format year-month name-date    e g  2011-MAR-12 or 2011-March-6    Capitalisation is not important function validDate d      var bits   d split  -      var t   stringToDate d     return t getFullYear      bits 0   amp  amp            t getDate      bits 2         Convert string in format above to a date object function stringToDate s      var bits   s split  -      var monthNum   monthNameToNumber bits 1      return new Date bits 0   monthNum  bits 2          Convert month names like mar or march to     number  capitalisation not important    Month number is calendar month - 1  var monthNameToNumber    function       var monthNames           jan feb mar apr may jun jul aug sep oct nov dec           january february march april may june july august           september october november december         split          return function month        var i   monthNames length      month   month toLowerCase          while  i--          if  monthNames i     month            return i   12                              Given a date in above format  return    previous day as a date object function getYesterday d      d   stringToDate d     d setDate d getDate   - 1    return d        Given a date object  format    per format above var formatDate    function       var months    jan feb mar apr may jun jul aug sep oct nov dec  split         function addZ n        return n lt 10   0  n      n        return function d        return d getFullYear      -                months d getMonth       -                addZ d getDate                function doStuff d          Is it format year-month-date    if   validDate d         alert d     is not a valid date        return      else       alert d     is a valid date          alert       Date in was      d         nDay before      formatDate getYesterday d            doStuff  2011-feb-08       Shows 2011-feb-08 is a valid date          Date in was  2011-feb-08          Day before  2011-feb-07

User · Answer

Get yesterday date in javascript   You have to run code and check it output   x000D   x000D      var today   new Date    x000D      var yesterday   new Date today   x000D       x000D      yesterday setDate today getDate   - 1   x000D      console log  Original Date     yesterday   x000D   x000D      const monthNames     x000D     Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec  x000D     x000D      var month   today getMonth     1 x000D      yesterday   yesterday getDate           monthNames month          yesterday getFullYear   x000D      x000D      console log  Modify Date     yesterday   x000D   x000D   x000D

User · Answer

One liner   var yesterday   new Date Date now   - 864e5      864e5    86400000    24 60 60 1000

User · Answer

Yesterday Date can be calculated as -  let now   new Date        var defaultDate   now - 1000   60   60   24   1      defaultDate   new Date defaultDate

[javascript] Javascript code for showing yesterday's date and todays date

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