remove the initial sha to workaround a bug in pd?

bfs-result.json

@@ -1,6 +1,5 @@
 {
   "Tue, 23 Nov 2021 15:17:06 +0000": {
-    "sha": "87ceb100732c3be66d5dcae16382d67e3208ec92",
     "total": "238",
     "pass": "90",
     "fail": "148"

gnu-result.json

@@ -1,6 +1,5 @@
 {
   "Tue, 23 Nov 2021 15:17:06 +0000": {
-    "sha": "87ceb100732c3be66d5dcae16382d67e3208ec92",
     "total": "16",
     "pass": " 3",
     "skip": " 1",

graph.py

@@ -15,7 +15,8 @@ df.columns.names = ["date"]
 as_list = df.index.tolist()
 for i in as_list:
     idx = as_list.index(i)
-    as_list[idx] = str(i).split(" ")[0]
+    t = parsedate(i)
+    as_list[idx] = datetime.fromtimestamp(time.mktime(t))
 
 df.index = as_list