*Все действия производим в приложении Магазин -> Витрина -> Шаблоны

1) В файле home.html после строки:

{if !empty($promo.body)}<p style="color: {$promo.color};">{$promo.body|escape}</p>{/if}

добавляем строки:

{if !empty($promo.countdown_datetime) && time() <= strtotime($promo.countdown_datetime)}
	<div class="countdown">
		<span class="js-promo-countdown"
			  data-start="{date('Y-m-d H:i:s')}"
			  data-end="{$promo.countdown_datetime}">
		</span>
	</div>
{/if}

2) Создаем новый файл с именем:

jquery.countdownTimer.css

и содержимым:

/*

 * Author - Harshen Amarnath Pandey
 * Version - 1.0.8
 * Release - 18th April 2015
 * Copyright (c) 2014 - 2018 Harshen Pandey
*/

/* jquery.countdownTimer.css*/

.style {
   width: 100%;
   font-family: sans-serif;
   font-weight: bold;
}

.colorDefinition {
    color : #FFFFFF;
}

.size_xl {
   font-size:50px;
}

.size_lg {
   font-size:40px;
}

.size_md {
   font-size:30px;
}

.size_sm {
   font-size:20px;
}

.size_xs {
   font-size:15px;
}

.promos ul li a h5 {
    margin-top: 0;
}

3) Создаем новый файл с именем:

jquery.countdownTimer.min.js

и содержимым:

/*

 * Author - Harshen Amarnath Pandey
 * Version - 1.0.8
 * Release - 18th April 2015
 * Copyright (c) 2014 - 2018 Harshen Pandey
*/

!function(n){function t(t,c){var S=n.extend({},n.fn.countdowntimer.defaults,c),t=t;t.addClass("style");var m="",M="",h="",v="";if(m=S.size,M=S.borderColor,h=S.fontColor,v=S.backgroundColor,void 0!=c.regexpMatchFormat&&void 0!=c.regexpReplaceWith&&void 0==c.timeSeparator&&(window["regexpMatchFormat_"+t.attr("id")]=c.regexpMatchFormat,window["regexpReplaceWith_"+t.attr("id")]=c.regexpReplaceWith),void 0!=c.borderColor||void 0!=c.fontColor||void 0!=c.backgroundColor){var g={background:v,color:h,"border-color":M};t.css(g)}else t.addClass("colorDefinition");if(void 0!=c.size)switch(m){case"xl":t.addClass("size_xl");break;case"lg":t.addClass("size_lg");break;case"md":t.addClass("size_md");break;case"sm":t.addClass("size_sm");break;case"xs":t.addClass("size_xs")}else"sm"==m&&t.addClass("size_sm");if(void 0!=c.startDate||void 0!=c.dateAndTime||void 0!=c.currentTime||void 0==c.hours&&void 0==c.minutes&&void 0==c.seconds)if(void 0!=c.startDate&&void 0!=c.dateAndTime&&void 0==c.currentTime){startDate="",endDate="",timer_startDate="",window["startDate"+t.attr("id")]=new Date(S.startDate),window["endDate"+t.attr("id")]=new Date(S.dateAndTime);var p="withStart";a(t,S,p),window["timer_startDate"+t.attr("id")]=setInterval(function(){a(t,S,p)},1e3*S.tickInterval)}else if(void 0==c.startDate&&void 0!=c.dateAndTime&&void 0==c.currentTime){startTime="",dateTime="",timer_givenDate="";var I=S.startDate.getHours()<10?"0"+S.startDate.getHours():S.startDate.getHours(),f=S.startDate.getMinutes()<10?"0"+S.startDate.getMinutes():S.startDate.getMinutes(),k=S.startDate.getSeconds()<10?"0"+S.startDate.getSeconds():S.startDate.getSeconds(),D=S.startDate.getMonth()+1<10?"0"+(S.startDate.getMonth()+1):S.startDate.getMonth()+1,T=S.startDate.getDate()<10?"0"+S.startDate.getDate():S.startDate.getDate(),x=S.startDate.getFullYear();window["startTime"+t.attr("id")]=new Date(x+"/"+D+"/"+T+" "+I+":"+f+":"+k),window["dateTime"+t.attr("id")]=new Date(S.dateAndTime);var p="withnoStart";a(t,S,p),window["timer_givenDate"+t.attr("id")]=setInterval(function(){a(t,S,p)},1e3*S.tickInterval)}else void 0!=c.currentTime?(currentTime="",timer_currentDate="",window["currentTime"+t.attr("id")]=S.currentTime,_(t,S),window["timer_currentDate"+t.attr("id")]=setInterval(function(){_(t,S)},1e3*S.tickInterval)):(countSeconds="",timer_secondsTimer="",window["countSeconds"+t.attr("id")]=S.seconds,window["timer_secondsTimer"+t.attr("id")]=setInterval(function(){u(t)},1e3));else void 0!=c.hours&&void 0==c.minutes&&void 0==c.seconds?(hours_H="",minutes_H="",seconds_H="",timer_H="",window["hours_H"+t.attr("id")]=S.hours,window["minutes_H"+t.attr("id")]=S.minutes,window["seconds_H"+t.attr("id")]=S.seconds,void 0!=c.pauseButton&&l(t,"H",S,e),void 0!=c.stopButton&&H(t,"H",S,e),e(t,S),window["timer_H"+t.attr("id")]=setInterval(function(){e(t,S)},1e3*S.tickInterval)):void 0==c.hours&&void 0!=c.minutes&&void 0==c.seconds?(hours_M="",minutes_M="",seconds_M="",timer_M="",window["hours_M"+t.attr("id")]=S.hours,window["minutes_M"+t.attr("id")]=S.minutes,window["seconds_M"+t.attr("id")]=S.seconds,void 0!=c.pauseButton&&l(t,"M",S,o),void 0!=c.stopButton&&H(t,"M",S,o),o(t,S),window["timer_M"+t.attr("id")]=setInterval(function(){o(t,S)},1e3*S.tickInterval)):void 0==c.hours&&void 0==c.minutes&&void 0!=c.seconds?(hours_S="",minutes_S="",seconds_S="",timer_S="",window["hours_S"+t.attr("id")]=S.hours,window["minutes_S"+t.attr("id")]=S.minutes,window["seconds_S"+t.attr("id")]=S.seconds,void 0!=c.pauseButton&&l(t,"S",S,i),void 0!=c.stopButton&&H(t,"S",S,i),i(t,S),window["timer_S"+t.attr("id")]=setInterval(function(){i(t,S)},1e3*S.tickInterval)):void 0!=c.hours&&void 0!=c.minutes&&void 0==c.seconds?(hours_HM="",minutes_HM="",seconds_HM="",timer_HM="",window["hours_HM"+t.attr("id")]=S.hours,window["minutes_HM"+t.attr("id")]=S.minutes,window["seconds_HM"+t.attr("id")]=S.seconds,void 0!=c.pauseButton&&l(t,"HM",S,w),void 0!=c.stopButton&&H(t,"HM",S,w),w(t,S),window["timer_HM"+t.attr("id")]=setInterval(function(){w(t,S)},1e3*S.tickInterval)):void 0==c.hours&&void 0!=c.minutes&&void 0!=c.seconds?(hours_MS="",minutes_MS="",seconds_MS="",timer_MS="",window["hours_MS"+t.attr("id")]=S.hours,window["minutes_MS"+t.attr("id")]=S.minutes,window["seconds_MS"+t.attr("id")]=S.seconds,void 0!=c.pauseButton&&l(t,"MS",S,d),void 0!=c.stopButton&&H(t,"MS",S,d),d(t,S),window["timer_MS"+t.attr("id")]=setInterval(function(){d(t,S)},1e3*S.tickInterval)):void 0!=c.hours&&void 0==c.minutes&&void 0!=c.seconds?(hours_HS="",minutes_HS="",seconds_HS="",timer_HS="",window["hours_HS"+t.attr("id")]=S.hours,window["minutes_HS"+t.attr("id")]=S.minutes,window["seconds_HS"+t.attr("id")]=S.seconds,void 0!=c.pauseButton&&l(t,"HS",S,s),void 0!=c.stopButton&&H(t,"HS",S,s),s(t,S),window["timer_HS"+t.attr("id")]=setInterval(function(){s(t,S)},1e3*S.tickInterval)):void 0!=c.hours&&void 0!=c.minutes&&void 0!=c.seconds&&(hours_HMS="",minutes_HMS="",seconds_HMS="",timer_HMS="",window["hours_HMS"+t.attr("id")]=S.hours,window["minutes_HMS"+t.attr("id")]=S.minutes,window["seconds_HMS"+t.attr("id")]=S.seconds,void 0!=c.pauseButton&&l(t,"HMS",S,r),void 0!=c.stopButton&&H(t,"HMS",S,r),r(t,S),window["timer_HMS"+t.attr("id")]=setInterval(function(){r(t,S)},1e3*S.tickInterval))}function e(n,t){var e=n.attr("id");window["minutes_H"+e]==t.minutes&&window["seconds_H"+e]==t.seconds&&window["hours_H"+e]==t.hours?(window["hours_H"+e].toString().length<2&&(window["hours_H"+e]="0"+window["hours_H"+e]),S(n,window["hours_H"+e]+t.timeSeparator+"00"+t.timeSeparator+"00"),window["seconds_H"+e]=60-t.tickInterval,window["minutes_H"+e]=59,0!=window["hours_H"+e]?window["hours_H"+e]--:(delete window["hours_H"+e],delete window["minutes_H"+e],delete window["seconds_H"+e],clearInterval(window["timer_H"+e]),c(n,t))):(window["hours_H"+e].toString().length<2&&(window["hours_H"+e]="0"+window["hours_H"+e]),window["minutes_H"+e].toString().length<2&&(window["minutes_H"+e]="0"+window["minutes_H"+e]),window["seconds_H"+e].toString().length<2&&(window["seconds_H"+e]="0"+window["seconds_H"+e]),S(n,window["hours_H"+e]+t.timeSeparator+window["minutes_H"+e]+t.timeSeparator+window["seconds_H"+e]),window["seconds_H"+e]-=t.tickInterval,0!=window["minutes_H"+e]&&window["seconds_H"+e]<0&&(window["minutes_H"+e]--,window["seconds_H"+e]=60-t.tickInterval),0==window["minutes_H"+e]&&window["seconds_H"+e]<0&&0!=window["hours_H"+e]&&(window["hours_H"+e]--,window["minutes_H"+e]=59,window["seconds_H"+e]=60-t.tickInterval),0==window["minutes_H"+e]&&window["seconds_H"+e]<0&&0==window["hours_H"+e]&&(delete window["hours_H"+e],delete window["minutes_H"+e],delete window["seconds_H"+e],clearInterval(window["timer_H"+e]),c(n,t))),e=null}function o(n,t){var e=n.attr("id");window["minutes_M"+e]==t.minutes&&window["seconds_M"+e]==t.seconds?(window["minutes_M"+e].toString().length<2&&(window["minutes_M"+e]="0"+window["minutes_M"+e]),S(n,window["minutes_M"+e]+t.timeSeparator+"00"),window["seconds_M"+e]=60-t.tickInterval,0!=window["minutes_M"+e]?window["minutes_M"+e]--:(delete window["hours_M"+e],delete window["minutes_M"+e],delete window["seconds_M"+e],clearInterval(window["timer_M"+e]),c(n,t))):(window["minutes_M"+e].toString().length<2&&(window["minutes_M"+e]="0"+window["minutes_M"+e]),window["seconds_M"+e].toString().length<2&&(window["seconds_M"+e]="0"+window["seconds_M"+e]),S(n,window["minutes_M"+e]+t.timeSeparator+window["seconds_M"+e]),window["seconds_M"+e]-=t.tickInterval,0!=window["minutes_M"+e]&&window["seconds_M"+e]<0&&(window["minutes_M"+e]--,window["seconds_M"+e]=60-t.tickInterval),0==window["minutes_M"+e]&&window["seconds_M"+e]<0&&(delete window["hours_M"+e],delete window["minutes_M"+e],delete window["seconds_M"+e],clearInterval(window["timer_M"+e]),c(n,t))),e=null}function i(n,t){var e=n.attr("id");window["seconds_S"+e].toString().length<2&&(window["seconds_S"+e]="0"+window["seconds_S"+e]),S(n,window["seconds_S"+e]+" sec"),window["seconds_S"+e]-=t.tickInterval,window["seconds_S"+e]<0&&(delete window["hours_S"+e],delete window["minutes_S"+e],delete window["seconds_S"+e],clearInterval(window["timer_S"+e]),c(n,t)),e=null}function w(n,t){var e=n.attr("id");window["minutes_HM"+e]==t.minutes&&window["hours_HM"+e]==t.hours?(window["hours_HM"+e].toString().length<2&&(window["hours_HM"+e]="0"+window["hours_HM"+e]),window["minutes_HM"+e].toString().length<2&&(window["minutes_HM"+e]="0"+window["minutes_HM"+e]),S(n,window["hours_HM"+e]+t.timeSeparator+window["minutes_HM"+e]+t.timeSeparator+"00"),0!=window["hours_HM"+e]&&0==window["minutes_HM"+e]?(window["hours_HM"+e]--,window["minutes_HM"+e]=59,window["seconds_HM"+e]=60-t.tickInterval):0==window["hours_HM"+e]&&0!=window["minutes_HM"+e]?(window["seconds_HM"+e]=60-t.tickInterval,window["minutes_HM"+e]--):(window["seconds_HM"+e]=60-t.tickInterval,window["minutes_HM"+e]--),0==window["hours_HM"+e]&&0==window["minutes_HM"+e]&&60==window["seconds_HM"+e]&&(delete window["hours_HM"+e],delete window["minutes_HM"+e],delete window["seconds_HM"+e],clearInterval(window["timer_HM"+e]),c(n,t))):(window["hours_HM"+e].toString().length<2&&(window["hours_HM"+e]="0"+window["hours_HM"+e]),window["minutes_HM"+e].toString().length<2&&(window["minutes_HM"+e]="0"+window["minutes_HM"+e]),window["seconds_HM"+e].toString().length<2&&(window["seconds_HM"+e]="0"+window["seconds_HM"+e]),S(n,window["hours_HM"+e]+t.timeSeparator+window["minutes_HM"+e]+t.timeSeparator+window["seconds_HM"+e]),window["seconds_HM"+e]-=t.tickInterval,0!=window["minutes_HM"+e]&&window["seconds_HM"+e]<0&&(window["minutes_HM"+e]--,window["seconds_HM"+e]=60-t.tickInterval),0==window["minutes_HM"+e]&&window["seconds_HM"+e]<0&&0!=window["hours_HM"+e]&&(window["hours_HM"+e]--,window["minutes_HM"+e]=59,window["seconds_HM"+e]=60-t.tickInterval),0==window["minutes_HM"+e]&&window["seconds_HM"+e]<0&&0==window["hours_HM"+e]&&(delete window["hours_HM"+e],delete window["minutes_HM"+e],delete window["seconds_HM"+e],clearInterval(window["timer_HM"+e]),c(n,t))),e=null}function d(n,t){var e=n.attr("id");window["minutes_MS"+e]==t.minutes&&window["seconds_MS"+e]==t.seconds?(window["minutes_MS"+e].toString().length<2&&(window["minutes_MS"+e]="0"+window["minutes_MS"+e]),window["seconds_MS"+e].toString().length<2&&(window["seconds_MS"+e]="0"+window["seconds_MS"+e]),S(n,window["minutes_MS"+e]+t.timeSeparator+window["seconds_MS"+e]),0!=window["minutes_MS"+e]&&0==window["seconds_MS"+e]?(window["minutes_MS"+e]--,window["seconds_MS"+e]=60-t.tickInterval):0==window["minutes_MS"+e]&&0==window["seconds_MS"+e]?(delete window["hours_MS"+e],delete window["minutes_MS"+e],delete window["seconds_MS"+e],clearInterval(window["timer_MS"+e]),c(n,t)):window["seconds_MS"+e]-=t.tickInterval):(window["minutes_MS"+e].toString().length<2&&(window["minutes_MS"+e]="0"+window["minutes_MS"+e]),window["seconds_MS"+e].toString().length<2&&(window["seconds_MS"+e]="0"+window["seconds_MS"+e]),S(n,window["minutes_MS"+e]+t.timeSeparator+window["seconds_MS"+e]),window["seconds_MS"+e]-=t.tickInterval,0!=window["minutes_MS"+e]&&window["seconds_MS"+e]<0&&(window["minutes_MS"+e]--,window["seconds_MS"+e]=60-t.tickInterval),0==window["minutes_MS"+e]&&window["seconds_MS"+e]<0&&(delete window["hours_MS"+e],delete window["minutes_MS"+e],delete window["seconds_MS"+e],clearInterval(window["timer_MS"+e]),c(n,t))),e=null}function s(n,t){var e=n.attr("id");window["seconds_HS"+e]==t.seconds&&window["hours_HS"+e]==t.hours?(window["hours_HS"+e].toString().length<2&&(window["hours_HS"+e]="0"+window["hours_HS"+e]),window["seconds_HS"+e].toString().length<2&&(window["seconds_HS"+e]="0"+window["seconds_HS"+e]),S(n,window["hours_HS"+e]+t.timeSeparator+"00"+t.timeSeparator+window["seconds_HS"+e]),0==window["hours_HS"+e]&&0==window["seconds_HS"+e]?(delete window["hours_HS"+e],delete window["minutes_HS"+e],delete window["seconds_HS"+e],clearInterval(window["timer_HS"+e]),c(n,t)):0!=window["hours_HS"+e]&&0==window["seconds_HS"+e]?(window["hours_HS"+e]--,window["minutes_HS"+e]=59,window["seconds_HS"+e]=60-t.tickInterval):window["seconds_HS"+e]-=t.tickInterval):(window["hours_HS"+e].toString().length<2&&(window["hours_HS"+e]="0"+window["hours_HS"+e]),window["minutes_HS"+e].toString().length<2&&(window["minutes_HS"+e]="0"+window["minutes_HS"+e]),window["seconds_HS"+e].toString().length<2&&(window["seconds_HS"+e]="0"+window["seconds_HS"+e]),S(n,window["hours_HS"+e]+t.timeSeparator+window["minutes_HS"+e]+t.timeSeparator+window["seconds_HS"+e]),window["seconds_HS"+e]-=t.tickInterval,0!=window["minutes_HS"+e]&&window["seconds_HS"+e]<0&&(window["minutes_HS"+e]--,window["seconds_HS"+e]=60-t.tickInterval),0==window["minutes_HS"+e]&&window["seconds_HS"+e]<0&&0!=window["hours_HS"+e]&&(window["hours_HS"+e]--,window["minutes_HS"+e]=59,window["seconds_HS"+e]=60-t.tickInterval),0==window["minutes_HS"+e]&&window["seconds_HS"+e]<0&&0==window["hours_HS"+e]&&(delete window["hours_HS"+e],delete window["minutes_HS"+e],delete window["seconds_HS"+e],clearInterval(window["timer_HS"+e]),c(n,t))),e=null}function r(n,t){var e=n.attr("id");window["minutes_HMS"+e]==t.minutes&&window["seconds_HMS"+e]==t.seconds&&window["hours_HMS"+e]==t.hours?(window["hours_HMS"+e].toString().length<2&&(window["hours_HMS"+e]="0"+window["hours_HMS"+e]),window["minutes_HMS"+e].toString().length<2&&(window["minutes_HMS"+e]="0"+window["minutes_HMS"+e]),window["seconds_HMS"+e].toString().length<2&&(window["seconds_HMS"+e]="0"+window["seconds_HMS"+e]),S(n,window["hours_HMS"+e]+t.timeSeparator+window["minutes_HMS"+e]+t.timeSeparator+window["seconds_HMS"+e]),0==window["hours_HMS"+e]&&0==window["minutes_HMS"+e]&&0==window["seconds_HMS"+e]?(delete window["hours_HMS"+e],delete window["minutes_HMS"+e],delete window["seconds_HMS"+e],clearInterval(window["timer_HMS"+e]),c(n,t)):0!=window["hours_HMS"+e]&&0==window["minutes_HMS"+e]&&0==window["seconds_HMS"+e]?(window["hours_HMS"+e]--,window["minutes_HMS"+e]=59,window["seconds_HMS"+e]=60-t.tickInterval):0==window["hours_HMS"+e]&&0!=window["minutes_HMS"+e]&&0==window["seconds_HMS"+e]?(window["minutes_HMS"+e]--,window["seconds_HMS"+e]=60-t.tickInterval):0!=window["hours_HMS"+e]&&0!=window["minutes_HMS"+e]&&0==window["seconds_HMS"+e]?(window["minutes_HMS"+e]--,window["seconds_HMS"+e]=60-t.tickInterval):window["seconds_HMS"+e]-=t.tickInterval):(window["hours_HMS"+e].toString().length<2&&(window["hours_HMS"+e]="0"+window["hours_HMS"+e]),window["minutes_HMS"+e].toString().length<2&&(window["minutes_HMS"+e]="0"+window["minutes_HMS"+e]),window["seconds_HMS"+e].toString().length<2&&(window["seconds_HMS"+e]="0"+window["seconds_HMS"+e]),S(n,window["hours_HMS"+e]+t.timeSeparator+window["minutes_HMS"+e]+t.timeSeparator+window["seconds_HMS"+e]),window["seconds_HMS"+e]-=t.tickInterval,0!=window["minutes_HMS"+e]&&window["seconds_HMS"+e]<0&&(window["minutes_HMS"+e]--,window["seconds_HMS"+e]=60-t.tickInterval),0==window["minutes_HMS"+e]&&window["seconds_HMS"+e]<0&&0!=window["hours_HMS"+e]&&(window["hours_HMS"+e]--,window["minutes_HMS"+e]=59,window["seconds_HMS"+e]=60-t.tickInterval),0==window["minutes_HMS"+e]&&window["seconds_HMS"+e]<0&&0==window["hours_HMS"+e]&&(delete window["hours_HMS"+e],delete window["minutes_HMS"+e],delete window["seconds_HMS"+e],clearInterval(window["timer_HMS"+e]),c(n,t))),e=null}function a(n,t,e){var o=n.attr("id"),i="withnoStart"==e?window["dateTime"+o]:window["endDate"+o],w="withnoStart"==e?window["startTime"+o]:window["startDate"+o],d=Math.floor((i-w)/864e5),s=Math.floor((i-w)%864e5/36e5),r=Math.floor((i-w)%864e5/6e4)%60,a=Math.floor((i-w)%864e5/1e3)%60%60;i-w>0?(d.toString().length<2&&(d="0"+d),s.toString().length<2&&(s="0"+s),r.toString().length<2&&(r="0"+r),a.toString().length<2&&(a="0"+a),S(n,d+t.timeSeparator+s+t.timeSeparator+r+t.timeSeparator+a),"withnoStart"==e?window["startTime"+o].setSeconds(window["startTime"+o].getSeconds()+t.tickInterval):window["startDate"+o].setSeconds(window["startDate"+o].getSeconds()+t.tickInterval)):(S(n,"00"+t.timeSeparator+"00"+t.timeSeparator+"00"+t.timeSeparator+"00"),"withnoStart"==e?(delete window["dateTime"+o],delete window["startTime"+o],clearInterval(window["timer_givenDate"+o])):"withStart"==e&&(delete window["startDate"+o],delete window["endDate"+o],clearInterval(window["timer_startDate"+o])),c(n,t)),o=null}function _(n,t){if(1==window["currentTime"+n.attr("id")]){var e=new Date,o=e.getHours(),i=e.getMinutes(),w=e.getSeconds();o.toString().length<2&&(o="0"+o),i.toString().length<2&&(i="0"+i),w.toString().length<2&&(w="0"+w),S(n,o+t.timeSeparator+i+t.timeSeparator+w)}else alert("Set Current Time option.")}function u(n){var t=n.attr("id");window["countSeconds"+t].toString().length<2&&(window["countSeconds"+t]="0"+window["countSeconds"+t]),S(n,window["countSeconds"+t]+" sec"),window["countSeconds"+t]--,-1==window["countSeconds"+t]&&(delete window["countSeconds"+t],clearInterval(window["timer_secondsTimer"+t])),t=null}function c(t,e){null!=e.timeUp&&1==n.isFunction(e.timeUp)&&e.timeUp.apply(t,[]),null!=e.expiryUrl&&(window.location=e.expiryUrl)}function S(n,t){var e=t;if("undefined"!=typeof window["regexpMatchFormat_"+n.attr("id")]&&"undefined"!=typeof window["regexpReplaceWith_"+n.attr("id")]){var o=new RegExp(window["regexpMatchFormat_"+n.attr("id")]);e=t.replace(o,window["regexpReplaceWith_"+n.attr("id")])}n.html(e)}function l(t,e,o,i){n("#"+o.pauseButton).click(function(){"resume"!=n(this).val()?(n("#"+o.pauseButton).val("resume").text("Resume"),clearInterval(window["timer_"+e+t.attr("id")])):"resume"==n(this).val()&&(n("#"+o.pauseButton).val("pause").text("Pause"),window["timer_"+e+t.attr("id")]=setInterval(function(){i(t,o)},1e3*o.tickInterval))})}function H(t,e,o,i){n("#"+o.stopButton).click(function(){"start"!=n(this).val()?(n("#"+o.stopButton).val("start").text("Start"),clearInterval(window["timer_"+e+t.attr("id")]),window["hours_"+e+t.attr("id")]=o.hours,window["minutes_"+e+t.attr("id")]=o.minutes,window["seconds_"+e+t.attr("id")]=o.seconds,i(t,o)):"start"==n(this).val()&&(n("#"+o.stopButton).val("stop").text("Stop"),window["timer_"+e+t.attr("id")]=setInterval(function(){i(t,o)},1e3*o.tickInterval))})}n.fn.countdowntimer=function(e){return this.each(function(){t(n(this),e)})},n.fn.countdowntimer.defaults={hours:0,minutes:0,seconds:60,startDate:new Date,dateAndTime:new Date("0000/00/00 00:00:00"),currentTime:!1,size:"sm",borderColor:"#F0068E",fontColor:"#FFFFFF",backgroundColor:"#000000",timeSeparator:":",tickInterval:1,timeUp:null,expiryUrl:null,regexpMatchFormat:null,regexpReplaceWith:null,pauseButton:null,stopButton:null}}(jQuery);

4) В конец файла head.html добавляем строки:

<link href="{$wa_active_theme_url}jquery.countdownTimer.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="{$wa_active_theme_url}jquery.countdownTimer.min.js?v={$wa->version(true)}"></script>

5) В конец файла comfortbuy.shop.js добавляем строки:

$(document).ready(function () {
    // countdown
    if ($.fn.countdowntimer) {
        $('.js-promo-countdown').each(function () {
            var $this = $(this).html('');
            var id = ($this.attr('id') || 'js-promo-countdown' + ('' + Math.random()).slice(2));
            $this.attr('id', id);
            var start = $this.data('start').replace(/-/g, '/');
            var end = $this.data('end').replace(/-/g, '/');
            $this.countdowntimer({
                startDate: start,
                dateAndTime: end,
                size: 'lg'
            });
        });
    }
});