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import toDate from '../../toDate/index'
import requiredArgs from '../requiredArgs/index'
var MILLISECONDS_IN_DAY = 86400000
// This function will be a part of public API when UTC function will be implemented.
// See issue: https://github.com/date-fns/date-fns/issues/376
export default function getUTCDayOfYear(dirtyDate) {
requiredArgs(1, arguments)
var date = toDate(dirtyDate)
var timestamp = date.getTime()
date.setUTCMonth(0, 1)
date.setUTCHours(0, 0, 0, 0)
var startOfYearTimestamp = date.getTime()
var difference = timestamp - startOfYearTimestamp
return Math.floor(difference / MILLISECONDS_IN_DAY) + 1
}
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