I have two fields, one is ISSUEDDATE and the other is ISSUEDTIME. I would like to concatenate fields so that the ISSUEDDATE is in m/dd/yyyy hh:mm:ss format.

My ISSUEDTIME field is a string and ISSUEDDATE is a date field and the ISSUEDDATE isn't consistent. Some of the values read as m/dd/yyyy 7:00:00 AM while others are m/d/yyyy. ISSUEDTIME isn't consistent either as some are AM/PM and others are 24 hour time.

How can I accomplish this without adding a field?

I have tried to concatenate the two fields, but it fails. Since there are two time formats, the solution below fails also. I can execute this via selection and field calculate but would like for it to be done in one go.

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  • 1
    I'd suggest posting sample rows with all types of time and date formats to make things easier. Oct 25, 2017 at 19:23
  • This is very easy to do in Excel. Just add them (don't concatenate); date is no of days since some start, time is the partial day(s). If you can't add an ArcMap field to that table, I would suggest using a testing table so you can try formats.
    – danak
    Oct 25, 2017 at 20:31
  • I don't want to do it in excel because I will lose my original objectID Oct 25, 2017 at 21:10

1 Answer 1


This can be done in field calculator. Open a field calculator window for your field IssuedDate. Set the parser to Python and check Show Codeblock. In the pre-logic script code box enter:

import re
from datetime import datetime

def timeconvert(timestr):
    if re.search("PM|AM|pm|am", timestr):
        newtime = datetime.strptime(timestr, '%I:%M:%S %p').time()
        newtime = datetime.strptime(timestr, "%H:%M:%S").time()
    return newtime

In the code box enter: datetime.combine(datetime.strptime(str( !IssuredDate! ).split(" ")[0] , "%m/%d/%Y"), timeconvert( !IssuedTime! ))

That should take care of the inconsistent entries in the IssuedDate field.

  • When ISSUEDTIME is in 24 hour format, a ValueError is thrown for the format, how can this be resolved, otherwise I think it works for the AM/PM format. Oct 25, 2017 at 21:16
  • 1
    I added a function that will parse the time in either 12 or 24 hour formats.
    – Jacob F
    Oct 26, 2017 at 15:04

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