Time-based Color Pixel (Cloudflare Worker)

A Cloudflare Worker that returns a 1x1 PNG pixel. By Elvis Mao

The color depends on whether the current time (Asia/Taipei) is within a given time range.

Usage

/?s=12:00&e=13:00&d=D4D4D4&c=FF9000

Query Parameters

Param	Description
s	Start time (HH:MM, 24-hour)
e	End time (HH:MM, 24-hour)
d	Default color (6-digit hex, no #)
c	Current color (6-digit hex, no #)

Behavior

• If current time is within [s, e) → returns color c
• Otherwise → returns color d
• Supports cross-midnight ranges (e.g., 23:00–01:00)
• Timezone: Asia/Taipei

Example

/?s=23:00&e=01:00&d=111111&c=00FF99

Development

Install dependencies:

pnpm install

Run tests:

pnpm test

Deploy:

wrangler deploy

Notes

• Response: image/png
• Cache-Control: no-store by default