javascript get day of year
// `date` is a Date object
const dayOfYear = date => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / (1000 * 60 * 60 * 24));
// Example
dayOfYear(new Date(2020, 04, 16)); // 137
javascript get day of year
// `date` is a Date object
const dayOfYear = date => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / (1000 * 60 * 60 * 24));
// Example
dayOfYear(new Date(2020, 04, 16)); // 137
javascript get day
var d = new Date();
var n = d.toLocaleString("en-US", { "weekday": "long" }); // Monday
n += "\n" + d.toLocaleString("en-US", { "weekday": "short" }); // Mon
n += "\n" + d.toLocaleString("en-US", { "weekday": "narrow" }); // M
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