Fix several parsing issues.

data/parser.js

@@ -2,12 +2,16 @@ import fs from 'fs/promises'
 import fg from 'fast-glob'
 import StreamZip from 'node-stream-zip'
 import TestingTrend from './parser/testing-trend.js'
+import path from 'path'
 
 async function main() {
   const sources = await fg(['./data/raw/*.zip'])
   sources.sort()
 
-  const zips = sources.map(source => new StreamZip.async({ file: source }))
+  const zips = sources.map(source => ({
+    date: path.basename(source, path.extname(source)),
+    zip: new StreamZip.async({ file: source })
+  }))
 
   await TestingTrend(zips)
 }