Contributing Advent 9: Day of the week
This is another one in the Date/Time extension series. Bugs #63391 and #61599 both deal with PHP getting the Day of Week wrong in years before 1600. Technically I did not write the patch for this contribution, but I did add tests, verified it and merged it to all the four branches (PHP 5.4, 5.5, 5.6 and master).
However, it does seem that I introduced the bug in the first place. When writing the new date/time support about 7 years ago I was looking for an algorithm that would tell me the day of the week for any given (Gregorian calendar) date. Wikipedia has quite a good article on it. The article outlines the calculation of the century number. For the Gregorian calendar, that's quite straight forwards: 6 - (j % 4) * 2. For the Julian calendar it's not very difficult either. Although PHP uses the proleptic Gregorian calendar that I wrote about before, I mistakenly had used a formula that combined the Julian and Gregorian calendar calculations. This then resulted in wrong calculations before the year 1600. This is now corrected and ready for inclusion into PHP 5.4.24, 5.5.7, and later versions.
Life Line
Juvenile Ruff stretching out.
Taken at Titchwell March.
#photography #Birds #BirdPhotography #BirdsOfFediverse #NaturePhotography #wildlife #Norfolk
Specify road surfaces
Specify whether there are cycleways
Survey housenumbers
Specify path surfaces
Specify whether crosswalks have tactile paving
Specify whether pedestrian crossings have islands
Specify whether kerbs have tactile paving
Determine the heights of kerbs
Specify whether bicycles can be charged at charging stations
Specify whether roads have sidewalks
Created 2 entrances; Updated an apartments building
I walked 7.5km in 1h38m33s
A very well camouflaged Little Owl.
It's in a hole in a church tower, in a tiny village in North Norfolk.
#photography #Birds #BirdPhotography #BirdsOfFediverse #NaturePhotography #Norfolk
Survey postbox collection times
Survey housenumbers
Specify whether places take fees to visit
Survey shop types
Specify whether there are cycleways
Specify whether pedestrian crossings have islands
Determine the heights of kerbs
Specify whether traffic signals have tactile indications that it's safe to cross
Specify whether crosswalks have tactile paving
Specify whether kerbs have tactile paving
Specify drinking water types
Shortlink
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