hints.md in appointment-time

Author: sahamdot

exercises/concept/appointment-time/.docs/hints.md

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+# Hints
+
+## 1. Create an appointment
+
+- `new Date()` can be used to create new date. You can pass timestamp to create specific date.
+- `Date.now()` gives you current timestamp.
+- A day consist of 24 hour. An hour consist of 60 minutes. A minute consist of 60 seconds. A second consist of 1000 milliseconds. In order to get timestamp of `n` days later from current date, you can sum current timestamp and `n * 24 * 60 * 60 * 1000`.
+
+## 2. Get details of an appointment
+
+- Date object has [built-in methods][mdn-date-methods] to get different parts of the date.
+
+## 3. Update an appointment with given options
+
+- Date object has [built-in methods][mdn-date-methods] to modify date.
+
+## 4. Get available times between two appointment
+
+- General subtraction between two dates will give you the timestamp between the two dates.
+
+## 5. Check if an appointment is now valid or not
+
+- Conditional operators will help you to decide which date is bigger or smaller between two dates.
+
+[mdn-date-methods]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#instance_methods