How to use Google Calendar as a diary (without time slots on it) to keep a record of the day?

The most apt way to make notes in Google Calendar is to use the description feature of any event.

1. Open your Google Calendar.

2. Click on the event you want to keep a record of.

3. Choose the pencil option to edit the event.

4. Under the ‘Description’ section, write your details. The texts can be as long as you want.