Some posted sales are showing wrong posted date

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Hello All,

We have seen an issue regarding the posted date of sales and want to see 
if anyone else is experiencing this, or if they may have some thoughts on 
what the issue may be.  We are using version 1.2.13.  Here are the steps 
that we used to produce issue.

1.  Enter and Post Invoice # 823 via POS screen (date posted: 9-12-2008)
2.  Enter and Post Invoice # 824 via POS screen (date posted: 9-12-2008)
3.  Enter and Post Invoice # 825 via POS screen (date posted: 9-12-2008)
4. Generate a Transactions report under AR

Results:
--------------------------------------------------------------
Invoice # 823   Posted Date = 09-12-2008
Invoice # 824   Posted Date = 09-11-2008
Invoice # 825   Posted Date = 09-12-2008

Notice that Invoice # 824 shows an incorrect posted date.  It appears to 
have been posted one day earlier which is not the case.  We have noticed 
this twice now.  The invoice #s are the actual ones.  Only mention this 
since you will notice that the 1st invoice was posted correctly, the 2nd 
was wrong, and the 3rd is posted correctly.  Any thoughts or suggestions?

Regards,

Steven