add timestamp

snippets/timestamp.md

@@ -0,0 +1,18 @@
+---
+title: functionName
+tags: date,beginner
+---
+
+Gets the Unix timestamp from a `Date` object
+
+- Use `new Date()` to get the Date object and `Date.prototype.getTime()` to get the timestamp in milliseconds and divide by 1000 to get the timestamp in seconds.
+- Use `Math.floor()` to appropriately round the resulting timestamp to an integer.
+
+```js
+const getTimestamp = date =>
+date.getTime()/1000
+```
+
+```js
+getTimestamp(new Date()); // 1602162242
+```