From 82d59bb8de77e219ddfc7ea97d6d603b885ca666 Mon Sep 17 00:00:00 2001
From: Angelos Chalaris <chalarangelo@gmail.com>
Date: Sat, 29 Sep 2018 13:22:20 +0300
Subject: [PATCH] Add dayOfYear

---
 snippets/dayOfYear.md | 16 ++++++++++++++++
 tag_database          |  1 +
 2 files changed, 17 insertions(+)
 create mode 100644 snippets/dayOfYear.md

diff --git a/snippets/dayOfYear.md b/snippets/dayOfYear.md
new file mode 100644
index 000000000..e40640777
--- /dev/null
+++ b/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
+```
diff --git a/tag_database b/tag_database
index 0487802f4..52a817d0a 100644
--- a/tag_database
+++ b/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