Blocker.day

Blocker.day helps you block time randomly and quickly, with a .ics calendar feed set to your desired availability.

Using random (but deterministic) blocks of unavailable time, you can quickly populate an otherwise sparse calendar app, including Apple or Google; or randomly limit availability in a scheduling app, including Cal.com and SavvyCal.

For example, Blocker.day in Apple Calendar, set to 1 hour blocks and 50% probability:
blocker.day/calendar.ics?h=1&p=0.50

Features

• generate a unique .ics calendar feed of unavailable time
• deterministic pseudo-random availability based on your seed value, probability, and time block
• time blocks begin each day at midnight (00:00) in the timezone specified

Add or Subscribe: blocker.day/calendar

Add or subscribe to Blocker.day in your calendar or scheduling app. You can include the option .ics file extension and set DAYS, HOURS, and PROBABILITY in the URL query:

https://blocker.day/calendar
https://blocker.day/calendar.ics
https://blocker.day/calendar.ics?d=7&h=4&p=0.35
https://blocker.day/calendar.ics?days=7&hours=4&probability=0.35

Deploy to Cloudflare

Blocker.day is a Cloudflare Worker (serverless function) that generates a unique .ics calendar feeds.

Deploy your own Cloudflare Worker to change additional settings (using environment variables) including NAME, SEED, SEED_VIA_URL, and TIMEZONE,

Option 1: Deploy to Cloudflare

Option 2: Manual Deployment

1. Clone this repo:

git clone https://github.com/andesco/blocker.day.git
cd blocker.day

2. Customize default variables in wrangler.toml as needed. Example:

DAYS = "21"
HOURS = "4"
PROBABILITY = "0.25"
TIMEZONE = "America/Vancouver"

3. Install Cloudflare’s Wrangler CLI, login, and deploy:

npm install -g wrangler
wrangler login
wrangler deploy

Usage

Add or subscribe to a calendar using your worker subdomain, a custom subdomain, or blocker.day:

https://appname.username.workers.dev/calendar.ics

https://subdomain.personal.com/calenda.ics

https://blocker.day/calendar.ics

Calendar feeds generate consistent blocks of time based on the seed being used. To get a new set of randomized (but deterministic) blocks of time, update your Cloudflare Worker environment variables:

• change the default value of SEED; or
• set SEED_VIA_URL to true and set an optional per-calendar SEED in the URL query: https://subdomain.personal.com/calendar?seed=random-seed-value

Environment Variables

Variable	Description	Default
DAYS	number of days: 1–21	14
HOURS	hours in each block of time: 0.5, 1, 2, 3, 4, 6, 8, 12, 24	3
TIMEZONE	IANA timezone identifier	America/Toronto
NAME	calendar/event name displayed in apps	Blocker.day
PROBABILITY	probability of a time block: 0.00–1.00	0.50
REDIRECT	redirects hostname root	andesco/blocker.day
SEED	default seed value	default-seed-value
SEED_VIA_URL	enable setting SEED via URL query: true, false	false

URL Query Parameters

Variable	Description
days d	number of days: 1–21
hours h	hours in each block of time: 0.5, 1, 2, 3, 4, 6, 8, 12, 24
probability p	probability of a time block: 0.00–1.00
seed	calendar-specific seed value if SEED_VIA_URL is true