javascript date get day of year code example

Example 1: 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

Example 2: 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