Update yaml data to use string date, temporarily fixes #8

cgpm/meetings-en/meeting-01.yml

@@ -1,12 +1,12 @@
 ---
 metadata:
   title: 'Resolutions of the CGPM: 1st meeting'
-  date: 1889-09-28
+  date: '1889-09-28'
   source: BIPM - Pavillon de Breteuil
   url: https://www.bipm.org/en/CGPM/db/1
 resolutions:
 - dates:
-  - 1889-09-28
+  - '1889-09-28'
   title: Sanction of the international prototypes of the metre and the kilogram
   identifier: 1
   url: https://www.bipm.org/en/CGPM/db/1/1/
@@ -17,40 +17,40 @@ resolutions:
     message: The Conférence Générale des Poids et Mesures,
   considerations:
   - type: considering
-    date_effective: 1889-09-28
+    date_effective: '1889-09-28'
     message: considering the "Compte rendu of the President of the Comité International
       des Poids et Mesures (CIPM)" and the "Report of the CIPM", which show that,
       by the collaboration of the French section of the International Metre Commission
       and of the CIPM, the fundamental measurements of the international and national
       prototypes of the metre and of the kilogram have been made with all the accuracy
       and reliability which the present state of science permits;
   - type: considering
-    date_effective: 1889-09-28
+    date_effective: '1889-09-28'
     message: considering that the international and national prototypes of the metre
       and the kilogram are made of an alloy of platinum with 10 per cent iridium,
       to within 0.0001;
   - type: considering
-    date_effective: 1889-09-28
+    date_effective: '1889-09-28'
     message: considering the equality in length of the international Metre and the
       equality in mass of the international Kilogram with the length of the Metre
       and the mass of the Kilogram kept in the Archives of France;
   - type: considering
-    date_effective: 1889-09-28
+    date_effective: '1889-09-28'
     message: considering that the differences between the national Metres and the
       international Metre lie within 0.01 millimetre and that these differences are
       based on a hydrogen thermometer scale which can always be reproduced thanks
       to the stability of hydrogen, provided identical conditions are secured;
   - type: considering
-    date_effective: 1889-09-28
+    date_effective: '1889-09-28'
     message: considering that the differences between the national Kilograms and the
       international Kilogram lie within 1 milligram;
   - type: considering
-    date_effective: 1889-09-28
+    date_effective: '1889-09-28'
     message: considering that the international Metre and Kilogram and the national
       Metres and Kilograms fulfil the requirements of the Metre Convention,
   actions:
   - type: decides
-    date_effective: 1889-09-28
+    date_effective: '1889-09-28'
     message: |-
       *sanctions*
 

cgpm/meetings-en/meeting-03.yml

@@ -1,12 +1,12 @@
 ---
 metadata:
   title: 'Resolutions of the CGPM: 3rd meeting'
-  date: 1901-10-22
+  date: '1901-10-22'
   source: BIPM - Pavillon de Breteuil
   url: https://www.bipm.org/en/CGPM/db/3
 resolutions:
 - dates:
-  - 1901-10-22
+  - '1901-10-22'
   title: Declaration concerning the definition of the litre
   identifier: 1
   url: https://www.bipm.org/en/CGPM/db/3/1/
@@ -18,15 +18,15 @@ resolutions:
   considerations: []
   actions:
   - type: decides
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: 'declares The unit of volume, for high accuracy determinations, is the
       volume occupied by a mass of 1 kilogram of pure water, at its maximum density
       and at standard atmospheric pressure: this volume is called "litre".'
   - type: decides
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: declares . . .
 - dates:
-  - 1901-10-22
+  - '1901-10-22'
   title: Declaration on the unit of mass and on the definition of weight; conventional
     value of gn
   identifier: 2
@@ -38,33 +38,33 @@ resolutions:
     message: Unanimous
   considerations:
   - type: taking into account
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: "*Taking into account* the decision of the Comité International des Poids
       et Mesures of 15 October 1887, according to which the kilogram has been defined
       as unit of mass;"
   - type: taking into account
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: "*Taking into account* the decision contained in the sanction of the
       prototypes of the Metric System, unanimously accepted by the Conférence Générale
       des Poids et Mesures on 26 September 1889;"
   - type: considering
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: "*Considering* the necessity to put an end to the ambiguity which in
       current practice still exists on the meaning of the word _weight_, used sometimes
       for _mass_, sometimes for _mechanical force_;"
   actions:
   - type: decides
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: The Conference declares The kilogram is the unit of mass; it is equal
       to the mass of the international prototype of the kilogram;
   - type: decides
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: 'The Conference declares The word "weight" denotes a quantity of the
       same nature as a "force": the weight of a body is the product of its mass and
       the acceleration due to gravity; in particular, the standard weight of a body
       is the product of its mass and the standard acceleration due to gravity;'
   - type: decides
-    date_effective: 1901-10-22
+    date_effective: '1901-10-22'
     message: The Conference declares The value adopted in the International Service
       of Weights and Measures for the standard acceleration due to gravity is stem:[980.665
       "cm"/"s"^(2)], value already stated in the laws of some countries.

cgpm/meetings-en/meeting-07.yml

@@ -1,12 +1,12 @@
 ---
 metadata:
   title: 'Resolutions of the CGPM: 7th meeting'
-  date: 1927-10-06
+  date: '1927-10-06'
   source: BIPM - Pavillon de Breteuil
   url: https://www.bipm.org/en/CGPM/db/7
 resolutions:
 - dates:
-  - 1927-10-06
+  - '1927-10-06'
   title: Definition of the metre by the international Prototype
   identifier: 1
   url: https://www.bipm.org/en/CGPM/db/7/1/
@@ -18,7 +18,7 @@ resolutions:
   considerations: []
   actions:
   - type: decides
-    date_effective: 1927-10-06
+    date_effective: '1927-10-06'
     message: The unit of length is the metre, defined by the distance, at 0°, between
       the axes of the two central lines marked on the bar of platinum-iridium kept
       at the Bureau International des Poids et Mesures and declared Prototype of the