async function getHolidays(year)
{
	const response = await fetch("https://calendarific.com/api/v2/holidays?&api_key=8a467e39a9ae7875410a03765fbab59fbd7ed3e8&country=hr&year="+year+"&fbclid=IwAR2_T3wnW25Ld4olqdW-I_ra59iuLZAKkBmGY1TqmNa0SoeX9i7TEke1obg");
	const jsonresponse = await response.json();
	return jsonresponse.response.holidays;
}

function calculateSortIndex(holiday)
{
  holiday.sortIndex=holiday.date.datetime.year*100000000+holiday.date.datetime.month*1000+holiday.date.datetime.day;
}

async function getNextDate(day, month, year)
{
	day = parseInt(day);
	month = parseInt(month);
	year = parseInt(year);
	var currentIndex = year*100000000+month*1000+day;

	var year2019 = await getHolidays("2019");
	var year2020 = await getHolidays("2020");

	var bothyears = year2019.concat(year2020);

	bothyears.forEach(calculateSortIndex);

	bothyears.sort((a, b) => a.sortIndex - b.sortIndex);

	var date = null;
	for (var i=0;i<bothyears.length;i++)
	{
		if (currentIndex < bothyears[i].sortIndex)
			return bothyears[i];
	}

	return null;
}

document.getElementById("basicFetchButton").addEventListener("click", async function(){


		nextDate= await getNextDate("14","09","2019");
		if (nextDate)
			console.log(JSON.stringify(nextDate));



    });