vincentorback

function getWeekNumber(d) {
  d = new Date(+d) // Copy date so don't modify original.
  d.setHours(0, 0, 0, 0) // Reset hours.
  d.setDate(d.getDate() + 4 - (d.getDay() || 7)) // Set to nearest Thursday: current date + 4 - current day number and make Sunday's day number 7
  var yearStart = new Date(d.getFullYear(), 0, 1) // Get first day of year
  var weekNo = Math.ceil((((d - yearStart) / 86400000) + 1) / 7) // Calculate full weeks to nearest Thursday
  return weekNo // Return week number
}

var date = new Date()