Bewitchedyegor

$('#pick_period').on('apply.daterangepicker', (ev, picker) => {
        //insert your action here
});

Bewitchedyegor

    $('input[id="pick_period2"]').daterangepicker({
        singleDatePicker: true,
        showDropdowns: false,
        minDate: moment(today).add(1, 'days'),
        maxDate: moment(today).add(45, 'days'),
      //add locale to your daterangepicker call function
        locale: {
            format: 'DD-MM-YYYY',
            applyLabel: 'Принять',
            cancelLabel: 'Отмена',

Bewitchedyegor

$('#pickAgeStart').on('keyup keydown click change', function(e) {
  if ($(this).val() > 65 && e.keyCode !== 46 && e.keyCode !== 8) { //insert your value and < or > 
    e.preventDefault();
    $(this).val(65); //insert maximum/minimum value here
  }
});

Bewitchedyegor

    $(document).mouseup(function(e) {
        let container = $(".js-postOptionsMenu"); //insert container selector, multiple selectors for different containers will work fine
        if (!container.is(e.target) && container.has(e.target).length === 0) {
            container.fadeOut();//you can replace .fadeOut() with any other way to hide your container
        }
    });

Bewitchedyegor

    $('.copyLink').click( function(e) {
       let currenturl = 'http://'; //your domain
       let userid = $('html').find('.profileImage a').attr('href'); //get user ID
       let postid = $(e.target).parent().attr('id'); //get post ID
       let urlcopy = currenturl + userid + '#' + postid; //get the full link
       let $temp = $("<input>"); //create fake input
       $("body").append($temp); //add fake input to HTML
       $temp.val(urlcopy).select(); //insert full link to fake input
       document.execCommand("copy"); //copy full link from fake input to clipboard
       $temp.remove(); //remove fake input from HTML