Calendar flags

Flags with start date

Legend

1 dot: 1 week

2 dots: 2 weeks

3 dots: 3 weeks

1 stripe: 4 weeks

2 stripes: 5 weeks

3 stripes: 6 weeks

White: "before"

Yellow: "after"

Blue: winter (approx. November 15 - February 15; rounded to nearest Monday)

Green: spring (approx. February 15 - May 15)

Red: summer (approx. May 15 - August 15)

Black: autumn/fall (approx. August 15 - February 15)

Examples

The "middle" of spring

2 weeks after the "middle" of summer

6 weeks before the "middle" of autumn

I know that winter is typically regarded as December, January and February. However, I wanted the winter to be centered around New Year's so I moved it a fortnight back.

Usage

http://allanth.dk/calendar-flags/api.php

http://allanth.dk/calendar-flags/api.php?date=2018-07-04

or