Unix Epoch and PHP's calendar system
I just saw a commit flying past as a response to PHP bug #50155. While right now it is proper to define the Unix Epoch at "1970-01-01 00:00:00 UTC", UTC wasn't actually defined until 1972. So it would be more correct to define the Unix Epoch as "the number of seconds elapsed since midnight proleptic Coordinated Universal Time (UTC) of January 1, 1970, not counting leap seconds." (from Wikipedia). What the bit "not counting leap seconds" means, I've already explained before in Leap Seconds and What To Do With Them.
Similarly, PHP's internal calendar is the ISO 8601 calendar. This is a modification of the proleptic Gregorian calendar. The Gregorian calendar implements the current set of leap years every 4 years, but not every 100 years, but again every 400 years (to get to an average year length of 365.2425 days). Obviously this calendar is only in use since 1582 (some countries adopted it as late as the 1900s), so using days like 1066-10-14 in the Gregorian calendar makes little sense because that calendar didn't exist back then. Now, PHP's ISO 8601-based calendar even modifies the Gregorian calendar by including the year 0. The Gregorian calendar goes straight from -1 to 1 which is a pain to do proper date calculations with. Therefore the ISO 8601 calendar uses Astronomical year numbering.
Life Line
I walked 7.2km in 1h10m18s
Updated a pet_grooming shop; Deleted a dry_cleaning shop; Confirmed 2 variety_store shops, a fitness_centre, and a convenience shop
I walked 4.1km in 47m50s
I walked 1.2km in 9m08s
Map new layout of Meanwhile Gardens
I walked 10.4km in 1h45m58s
This is probably the shortest chapter I've ever read in any book. And it'll likely stay like that.
Created a bench
Created 10 benches, 3 climbingframes, and 3 other objects; Updated a bicycle_parking and a bench; Deleted a bench
I walked 8.5km in 1h34m09s
Whoop! PHP London is meeting again next week: https://meetu.ps/e/PXrS6/2XF6m/i
Created a massage shop; Confirmed an estate_agent office, a pet_grooming shop, and 2 other objects
I walked 9.9km in 1h50m43s
Add Canteen building back in, with additional tags
Twyford Station footpahts and road layout
Created 2 crossings and an insect_hotel
Created a bicycle_parking; Updated a bench
Updated a cafe
I walked 6.7km in 1h5m45s
Updated a bench; Deleted a bench
Created 5 gates, a crossing, and 3 other objects
Created a fast_food and a recycling; Updated 2 crossings and a bus_stop
I hiked 23.4km in 5h14m54s
I've finished reading Children of Memory, the third book in the series.
Another interesting take on forms of intelligent life.
A fourth one is going to get released later this year.
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