I found the link below which provides a comprehensive discussion of the Excel 
issues with dates and work arounds.

http://www.exceluser.com/formulas/earlydates.htm

I am sure there are other discussions and work arounds.  This was just one of 
the more comprehensive discussions that I found.

Hope this helps.

Jim

Sent from my iPhone

> On Jun 12, 2017, at 8:53 AM, Brian Kelly <[email protected]> wrote:
> 
> There is(or used to be) an Excel Add-on you can install for pre 1900 dates 
> but in its raw form versions of Excel up to 2007 did not understand dates 
> before 1 Jan 1900. Dates were stored internally as the number of days since 1 
> Jan 1900. If your Excel is working for dates before 1 Jan 1900 check your 
> installed add-ons or which tell us which version of Excel are  you using.
> 
> Brian Kelly
> 
>> On 12-Jun-17 10:35 AM, Pete Beatty wrote:
>> Michele, your current tip contains the following: "Excel can't handle 
>> pre-1901 dates so you will have a problem sorting by columns."
>> Excel Does not have a problem with dates prior 1901. It can handle all 
>> formats of dates. I have several spreadsheets with some having thousands of 
>> records with dates ranging between 0900 and present. I can sort, and filter 
>> all records correctly.
>> Perhaps you are referring to dates with prefixes. We sometimes think items 
>> such as "bef" Or "c" as dates. Technically they are not components of a 
>> date. When you add them to a date, they are interpreted as a character 
>> string, not a date. As a character string, the entries are not sorted as a 
>> date.
>> If this is the case, then excel can still properly sort. You may have to 
>> define a format, a relatively simple process, or perform a simple cleanup.
>> Pete
> 
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