message: Handle 'pd.Timestamp' when jsonifying
diff: @@ -34,6 +34,7 @@ from flask_babel import gettext as __
  from flask_cache import Cache
  import markdown as md
  import numpy
  +import pandas as pd
  import parsedatetime
  from past.builtins import basestring
  from pydruid.utils.having import Having
  @@ -360,11 +361,7 @@ def json_iso_dttm_ser(obj, pessimistic=False):
  val = base_json_conv(obj)
  if val is not None:
  return val
  - if isinstance(obj, datetime):
  - obj = obj.isoformat()
  - elif isinstance(obj, date):
  - obj = obj.isoformat()
  - elif isinstance(obj, time):
  + if isinstance(obj, (datetime, date, time, pd.Timestamp)):
  obj = obj.isoformat()
  else:
  if pessimistic:
  @@ -398,7 +395,7 @@ def json_int_dttm_ser(obj):
  val = base_json_conv(obj)
  if val is not None:
  return val
  - if isinstance(obj, datetime):
  + if isinstance(obj, (datetime, pd.Timestamp)):
  obj = datetime_to_epoch(obj)
  elif isinstance(obj, date):
  obj = (obj - EPOCH.date()).total_seconds() * 1000
  