Simplify date parsing (#195)

Create common functions parse_date, parse_month_year_date and parse_datetime.

Those functions support trying multiple formats, and come with default formats lists that support most of the date format encountered so far.

Notable change: year-month dates are now set to the end of month (impacted couchbase-server and ibm-aix).

src/php.py

@@ -1,26 +1,16 @@
 import json
+from common import dates
 from common import endoflife
-from datetime import datetime
 
 PHP_MAJOR_VERSIONS = [4, 5, 7, 8]
 
 
-# Date format is 03 Nov 2022
-# With some versions using 03 November 2022 instead
-# we return it as YYYY-MM-DD
-def parse_date(date_str):
-    try:
-        return datetime.strptime(date_str, "%d %b %Y").strftime("%Y-%m-%d")
-    except ValueError:
-        return datetime.strptime(date_str, "%d %B %Y").strftime("%Y-%m-%d")
-
-
 def fetch_versions(major_version):
     url = f"https://www.php.net/releases/index.php?json&max=-1&version={major_version}"
     response = endoflife.fetch_url(url)
     data = json.loads(response)
     for v in data:
-        data[v] = parse_date(data[v]["date"])
+        data[v] = dates.parse_date(data[v]["date"]).strftime("%Y-%m-%d")
         print(f"{v}: {data[v]}")
 
     return data