周的財季，使用JavaScript

Question

我試圖想出一個辦法找到本季度周，2周抵消。我們在本季度的第三個星期六（10.15.11，01.21.12等）發佈季度軟件版本。有沒有辦法獲得這些信息？

例如，本週將是本季度的第13周。

Answer 1

function getQuarterWeek(d) { 
    // Convert to UTC to avoid DST changes. 
    d = new Date(Date.UTC(d.getFullYear(), d.getMonth(), d.getDay())); 
    // For previous Saturday you would normally add one here. 
    // But we want to go back two weeks, so subtract 14. 
    d.setUTCDate(d.getUTCDate() - 13); 
    d.setUTCDate(d.getUTCDate() - d.getUTCDay() - 1); 
    // Save the timestamp of this Saturday. 
    var s = d.getTime(); 
    // Now get the first day of the quarter. 
    d.setUTCDate(1); 
    d.setUTCMonth(d.getUTCMonth() - d.getUTCMonth() % 3); 
    // And find the following Saturday. 
    d.setUTCDate(7 - d.getUTCDay()); 
    // Convert the time difference to weeks. 
    return (d.getTime() - s)/604800000 + 1; 
}