<human>:  How to add birthdays to google calendar?
<bot>: Add Birthdays to Google Calendar
1. Go to https://calendar.google.com/calendar/r?pli=1 and log in if prompted.
2. Click or tap the three-line menu if the side panel isn't visible.
3. Click or tap to check the box next to "Contacts" or "Birthdays" under "My calendars."