code: def to_ts(s):
          
  
          # Strip TZ portion if present
          m = Nginx.DATE_FMT.match(s)
          if m:
              s = m.group(1)
              delta = timedelta(seconds=int(m.group(3)) * (-1 if m.group(2) == '-' else 1)) # Offset from GMT
          else:
              delta = timedelta(seconds=0)
          dt = datetime.strptime(s, "%d/%b/%Y:%H:%M:%S")
          dt += delta
          return dt.strftime('%Y-%m-%dT%H:%M:%SZ')
docs: Parses an NGINX timestamp from  "30/Apr/2014:07:32:09 +0000" and returns it as ISO 8601"