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HTML 

              
                <div class="content">

  <h3>Todays Current Date</h3>
  <p id="today-now"></p>
  <h3>Todays Start and End Times </h3>
  <p id="today-start"></p>
  <p id="today-end"></p>

  <h3>More usable output</h3>
  <p id="today-date"></p>
  
  <p id="today-date-time"></p>
    <hr> 
   <h3>Months (Date Range)</h3>
  <h5>This Month</h5>
  <p id="this-month">
    
  </p>
  <h5>Last three months</h5>
  <p id="last-three-months"></p>
  
  <h5>Last twelve months</h5>
  <p id="last-twelve-months"></p>
  <hr> 
  
  <p>Working with javascript dates can be tricky there are additional libraries you can get and inject into your projects, but I like to keep things dependency free as far as possible.</p>

  <p>The date returned will be your <strong>current</strong> local time, this does not help when your API requires time for reporting. eg: all sales between now and now will be empty, as there would in most cases be no transactions happening on this exact millisecond.</p>

  <p>You need convert it to start at the start of the day to the end of the day, I simply set the hours to 24 hours on the date and then subtract one millisecond.</p>
  
  <h3>Update: 2022/02/03</h3>
  <p>Required a more friendly way to convert dates and either get the time, date or date time. So I added a function that allows for this now.</p>
  <code>friendlyDate(date,includeTime, includeDate)</code>
</div>
!

CSS 

              
                body{
  background: #131417;
  margin: 0 auto;
  font-family: SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
}
.content{
  padding: 2em;
  color: #fff;
  width: 800px;
  max-width:100%;
}
!

JS 

              
                let now = new Date();
let startDate: number;
let endDate: number;
let rangeDates = [];

startDate = new Date(now.setHours(0, 0, 0, 0));

endDate = new Date(now.setHours(24, 0, 0, 0) - 1);

//Output to HTML
// Todays Date
document.getElementById("today-now").innerHTML = now;

document.getElementById("today-start").innerHTML = startDate;

document.getElementById("today-end").innerHTML = endDate;

document.getElementById("today-date").innerHTML =
  friendlyDate(startDate, false, true) + " (yy/mm/dd)";

now = new Date();
document.getElementById("today-date-time").innerHTML =
  friendlyDate(now, true, true) + " (h:m:s) asd";

function friendlyDate(date, includeTime = true, includeDate = false) {
  const d = new Date(date);
  let dateString = "";

  if (includeDate)
    dateString +=
      d.getFullYear() + "/" + (d.getMonth() + 1) + "/" + d.getDate();

  if (includeTime)
    dateString += d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds();

  return dateString;
};



// pass through the number of the month January = 0 December = 11
// Defaults to current month
// you can also just pass the amount of months you would like to go back eg -3 will take you back three months
function startToEndMonths(
  startMonth = now.getMonth(), 
  endMonth = now.getMonth()
){
  if(startMonth < 0) startMonth = now.getMonth() + startMonth;
  const startDate = new Date(now.getFullYear(), startMonth, 1);
  const endDate = new Date(now.getFullYear(), endMonth, 0);
  return startDate + " to " + endDate;
};

document.getElementById("this-month").innerHTML = startToEndMonths();

document.getElementById("last-three-months").innerHTML = startToEndMonths(-3);

document.getElementById("last-twelve-months").innerHTML = startToEndMonths(-12);
!
999px

Console