Unix Time difference to display delay

Question

I am using two timestamps to determine delay in djnago project in views.py file :

    import datetime
    import dateutil.relativedelta

    def get_diff(url, header) :
       enc_data = utils.http_response('get', url, header)['body']
       json_data =  json.loads(enc_data)['data'] 
       timestamp =  json_data[0]["timestamp"].split('.')[0].split("T")
       lastModified =  json_data[0]["lastModified"].split('.')[0].split("T")
       timestamp = timestamp[0]+ ":" + timestamp[1]
       lastModified = lastModified[0]  + ":" +lastModified[1]
       print json_data[0]
       print timestamp , lastmodified
       diff = dateutil.relativedelta.relativedelta(lastModified, timestamp)
       return diff

This is giving error on terminal :

{u'applicationName': u'None', u'userName': u'LocalHardcodedUser', u'facilityId': None, u'resource': u'pat', u'parameters': {u'limit': u'10', u'name': u'sdgds'}, u'accessToken': u'6FDG-TR08', u'lastModified': u'2013-09-26T02:59:14.436562',
u'uri': u'/v1/pat/519b/clinical', u'method': u'GET', u'requestBody': u'', u'visitNumber': None, u'mr': None, u'timestamp': u'2013-09-25T11:48:01.074000', u'message': u'name', u'rrt': None, u'type': u'error', u'id', u'5242cd71c83', u'statusCode': 500}
2013-09-25:11:48:01 2013-09-26:02:40:03    #output of **print timestamp , lastmodified**
Internal Server Error: /v1/ready
Traceback (most recent call last):
  File "/home/arya/.virtualenv/Devel/.virtualenvs/hu/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 115, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/home/arya/apps/hma/views.py", line 538, in get_health_check
    diff=  get_diff
  File "/home/arya/apps/hma/views.py", line 531, in get_diff
    print dateutil.relativedelta.relativedelta(lastModified, timestamp)
  File "/home/arya/.virtualenv/Devel/.virtualenvs/hu/local/lib/python2.7/site-packages/dateutil/relativedelta.py", line 118, in __init__
    raise TypeError("relativedelta only diffs datetime/date")
TypeError: relativedelta only diffs datetime/date

Please any one explain correct format that relativedelta accepts.

Answer 1

You cannot pass strings into relativedelta. It requires you pass in datetime.datetime or datetime.date objects.

Your JSON data contains ISO8601 format timestamps, which is the the most parsable format available. You already have the dateutil library, just use that to parse the strings first:

import dateutil.relativedelta
import dateutil.parser

def get_diff(url, header) :
    enc_data = utils.http_response('get', url, header)['body']
    json_data = json.loads(enc_data)['data'] 
    timestamp = dateutil.parser.parse(json_data[0]["timestamp"])
    lastModified = dateutil.parser.parse(json_data[0]["lastModified"])
    diff = dateutil.relativedelta.relativedelta(lastModified, timestamp)
    return diff

Demo:

>>> import dateutil.parser
>>> import dateutil.relativedelta
>>> timestamp = dateutil.parser.parse('2013-09-25T11:48:01.074000')
>>> lastModified = dateutil.parser.parse('2013-09-26T02:59:14.436562')
>>> dateutil.relativedelta.relativedelta(lastModified, timestamp)
relativedelta(hours=+15, minutes=+11, seconds=+13, microseconds=+362562)