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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() |