Как исправить календарь

Подсмотрела в зарубежном блоге скрипт для выведения архива блога в виде календаря. Однако я не знаю как исправить код так, чтобы неделя начиналась с понедельника, а не с воскресенья. Вот код:

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var bcArchiveNavText = "Просмотр архива";
var bcArchiveNavPrev = '◄';
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callmth = mth;
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bcNavPrev = document.getElementById('bcFootPrev');
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bcNavPrev.innerHTML = '';
bcNavNext.innerHTML = '';
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a.innerHTML = bcArchiveNavPrev;
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a.href = bcNav[bcp];
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fill[2] = '28';
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var author = entry.author[0].name.$t;
var date = entry.published.$t;
var summary = entry.summary.$t;
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isPublished = isPublished.substring(1);
}
fillDate.push(isPublished);
if (fillTitles[isPublished]){
fillTitles[isPublished] = fillTitles[isPublished] + ' | ' + title;
}
else {
fillTitles[isPublished] = title;
}
li = document.createElement('li');
li.style.listType = 'none';
li.innerHTML = '<a href="https://pr-cy.ru/jump/?url="+link+'">'+title+'</a>';
ul.appendChild(li);
}
calDis.appendChild(ul);
var val1 = parseInt(calDay, 10)
var valxx = parseInt(calMonth, 10);
var val2 = valxx - 1;
var val3 = parseInt(calYear, 10);
var firstCalDay = new Date(val3,val2,1);
var val0 = firstCalDay.getDay();
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fillURL = fillDate[p];
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var bcCount = document.getElementById('bloggerCalendarList').getElementsByTagName('li');
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tr = document.createElement('tr');
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bcNav.push(bcInit[x].href);
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var m = bcList[0].split(',')[0];
var y = bcList[0].split(',')[1];
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timeOffset = encodeURIComponent(timeOffset);
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Подскажите, пожалуйста.