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Cultural Heritage Dates 
Understanding the provenance of an artwork. 
David Newbury 
@workergnome
What is Art Tracks? 
Art Tracks is a research project 
at the Carnegie Museum of Art.
What is Art Tracks? 
Art Tracks is a research project 
at the Carnegie Museum of Art. 
We're digitizing the history of ownership of art.
Oldest item 
Vase 
MESOPOTAMIAN, SUSA 
(C. 3000 BCE-2000 BCE) 
painted earthenware 
Walter Read Hovey Collection
Newest item 
My Heart Is Not Here My Heart's 
in The Highlands Chasing The Deers 
Rokni Haerizadeh 
(2013) 
gesso, ink, and watercolor on printed paper 
The Henry L. Hillman Fund
Museums are full of art. 
Art is culture. 
Art is also stuff.
Stuff has a history. 
— Created by an artist 
— Sold to collectors 
— Given to children 
— Sold at auctions 
Eventually, 
it ends up at a museum.
The record of this is called 
Provenance.
Provenance is a chain of ownership. 
Every time a painting changes hands, 
it's a new link in that chain.
Water Lilies (Nymphéas) 
Claude Oscar Monet [1840-1926]; Estate of Claude 
Oscar Monet; Michel Monet, son of the artist, Sorel 
Moussel, Dept. Eure et Loire, 1926 until 1950; Walter P. 
Chrysler, Jr. [1908-1988], New York, NY, 1950 until 1962; 
purchased by Museum, April 1962.
What Data?
The Person 
Name 
Birth 
Death 
Location 
Portrait of Isabella de' Cosimo I de Medici 
C. 1570-1574 
Alessandro Allori 
oil on canvas (transferred from panel) 
Gift of Mrs. Paul B. Ernst
The Transfer 
Acquisition Method 
Direct Transfer 
Auction 
Harry Shokler 
1942 
silkscreen on paper 
Leisser Art Fund
Metadata 
Stock numbers 
Footnotes 
Primary ownership 
Footed bowl 
C. 1925 
OTTO LINDIG (GERMAN, 1895–1966) 
earthenware 
Gift of Barry Friedman, Ltd.
Dates 
Acquisition 
Deacquisition 
Persimmon (Kaki) 
MAKI HAKU (JAPANESE, 1924–2000) 
woodcut with embossing on paper 
Bequest of Dr. James B. Austin
Dates are not a thing 
A date is a string representation 
of a particular moment of time. 
...At a particular location. 
...On earth.
Easy Date Problems: 
12/4/2014: 
December 4th or April 12th? 
Depends on your national standard. Don't do this. 
ISO 8601 is what you want. 
2014-12-04T00:00:00
Medium Date Problems: 
2014-12-04T00:00:00: 
December 4th or December 3rd? 
Depends on your location. Use UTC. 
Time zones matter. 
2014-12-04T00:00:00Z
Hard Date Problems: 
October 6th, 1582 
Exists in England. 
Doesn't exist in Italy. 
Date.new(1582,10,5) 
# ArgumentError: invalid date 
Date.new(1582,10,14,Date::ENGLAND) 
# <Date: 1582-10-14 ((2299170j,0s,0n),+0s,2361222j)> 
fantastic trolling opportunity here for tests.
Harder Date Problems: 
What year comes before 1 AD? 
— 0 AD? 
— 1 BCE? 
St. George and the Dragon 
YUGOSLAVIAN 
C. 1500 
oil on panel 
Gift of Dr. Walter Read Hovey
Choosing an Epoch
Unix Time 
Seconds since 0h Jan 1, 1970 
DateTime.new(2014,12,4,20,0,0).to_time.to_i 
# => 1417723200 
Valid between December 13, 1901 and 19 January 2038.
Gregorian 
The way you learned dates in school 
valid since Oct 15, 1582 
DateTime.new(2014,12,4,20,0,0).to_s 
# => "2014-12-04T20:00:00+00:00"
Julian Day 
The way Ruby represents dates 
days since 12h Jan 1, 4713 BC 
DateTime.new(2014,12,4,20,0,0).jd 
# => 2456996
Heliocentric Julian Day 
The current day. 
On the sun.
Barycentric Julian Day 
The current day. 
At the center of the solar system.
Dates in Ruby 
Mug 
TOBIAS BAUER (GERMAN) 
1695-1705 
blown, gold-ruby glass w/silver-gilt mounts 
DuPuy Fund
Time 
— Based on (and implemented in) C 
— Counts seconds from Unix Epoch 
— Compatible with Unix and other languages 
— Fast
Date && DateTime 
— Written in Ruby 
— Counts days from Julian Epoch 
— Slower
Internal Implementation 
if you #inspect a DateTime: 
DateTime.new(2014,12,4,20,0,0).inspect 
# <DateTime: 2014-12-04T20:00:00+00:00 ((2456996j,72000s,0n),+0s,2299161j)>
DateTime: 2014-12-04T20:00:00+00:00 ((2456996j,72000s,0n),+0s,2299161j) 
2014-12-04T20:00:00+00:00 
the current time in ISO 8601.
DateTime: 2014-12-04T20:00:00+00:00 ((2456996j,72000s,0n),+0s,2299161j) 
2456996j The number of days since the Julian Epoch 
+ 
72000s some number of seconds 
+ 
0n some number of nanoseconds
DateTime: 2014-12-04T20:00:00+00:00 ((2456996j,72000s,0n), +0s ,2299161j) 
+0s 
The offset in seconds from UTC time
DateTime: 2014-12-04T20:00:00+00:00 ((2456996j,72000s,0n),+0s, 2299161j ) 
2299161j 
The day of the Gregorian Reform.
Imprecise Data. 
Computers hate imprecision. 
Apr. 27, 1978 
ON KAWARA (JAPANESE, 1932–2014) 
1978 
Liquitex on canvas 
A. W. Mellon Acquisition Endowment Fund and Carnegie 
International Acquisition Fund
Precision 
— January 1, 1900 
— January 1900 
— 1900 
— the 1900s 
— the 20th Century 
What is the difference?
date_time_precision gem 
https://github.com/Spokeo/date_time_precision 
Extends Ruby Date, Time, and DateTime to include 
the notion of date precision.
require 'date_time_precision 
year = DateTime.new(1990) 
=> #<DateTime: 1990-01-01T00:00:00+00:00 ((2447893j,0s,0n),+0s,2299161j)> 
year.precision 
=> 1 # or DateTimePrecision::YEAR 
year.day? 
=> false 
year.year? 
=> true
Persists via copy 
new_year = year 
=> #<DateTime: 1990-01-01T00:00:00+00:00 ((2447893j,0s,0n),+0s,2299161j)> 
new_year.precision 
=> 1
Needed to handle DECADE && CENTURY precision 
year = DateTime.new(1755) 
year.decade 
=> 1750 
century = year 
century.precision = DateTimePrecision::CENTURY 
year.century 
=> 1700
Custom Extensions for Date#earliest && Date#latest 
year = Date.new(1755) 
year.earliest 
=> Wed, 01 Jan 1755 
year.latest 
=> Wed, 31 Dec 1755 
century = Date.new(1800) 
century.precision = DateTimePrecision::CENTURY 
century.earliest 
=> Wed, 01 Jan 1800 
century.latest 
=> Sun, 31 Dec 1899
Ontologies 
Modeling the data.
... 
What is the CIDOC CRM 
The CIDOC Conceptual Reference Model (CRM) 
provides definitions and a formal structure for 
describing the implicit and explicit concepts and 
relationships used in cultural heritage documentation. 
— http://www.cidoc-crm.org
A Timeline represents the 
entire history of ownership of a single work.
A Period is a single period in time 
representing an single owner of a work.
Beginnings & Endings
George, 1950; Mary 1965.
George, by 1960 until sometime after 1962; Mary, in 1970.
John Doe, 1995
John Doe, by 1995
John Doe, after 1995
John Doe, until 1995
John Doe, until at least 1995
John Doe, until sometime before 1995
John Doe, in 1960
John Doe, 1950 until 2000
require 'museum_provenance' 
text = "sold December 1936 to Robert Doe, Pittsburgh" 
period = MuseumProvenance::Period.new() 
puts period.parse_time_string(text) 
# => sold to Robert Doe, Pittsburgh 
puts period.beginning.to_s 
# => December 1936 
puts period.beginning.earliest 
# => 1936-12-01 
puts period.beginning.latest 
# => 1936-12-31 
puts period.ending.to_s 
# => nil
Why all this work?
Nazi War Crimes.
Thank You. 
https://github.com/cmoa/museum_provenance 
David Newbury 
@workergnome

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みなさんこんにちはこれ何文字まで入るの?40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの?えこ...
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