Add dayOfYear

snippets/dayOfYear.md

@@ -0,0 +1,16 @@
+### dayOfYear
+
+Gets the day of the year from a `Date` object.
+
+Use `new Date()` and `Date.prototype.getFullYear()` to get the first day of the year as a `Date` object, subtract it from the provided `date` and divide with the milliseconds in each day to get the result.
+Use `Math.floor()` to appropriately round the resulting day count to an integer.
+
+```js
+const dayOfYear = date => Math.floor(
+  (date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24
+);
+```
+
+```js
+dayOfYear(new Date()); // 272
+```

tag_database

@@ -44,6 +44,7 @@ CSVToArray:string,array,utility,intermediate
 CSVToJSON:string,array,object,advanced
 currentURL:browser,url,beginner
 curry:function,recursion,intermediate
+dayOfYear:date,beginner
 debounce:function,intermediate
 decapitalize:string,array,intermediate
 deepClone:object,recursion,intermediate