javascript - 给定一个日期 (m/d/yyyy) 确定它是否是当月的 "the third tuesday"等

Question

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Answer 1

您不需要日期库 - 只需将日期除以 7 然后四舍五入即可。

//format: Day, Month Date, YYYY
var ordinals = ["", "first", "second", "third", "fourth", "fifth"];
var date = "Friday, May 10, 2013";
var tokens = date.split(/[ ,]/);
// tokens = ["Friday", "", "May", "10", "", "2013"];
console.log( "The " + ordinals[Math.ceil(tokens[3]/7)] + " " + tokens[0] + " of the month");