What algorithm is used to Sort Photos?

I've read a LOT of posts asking about the sorting order for photos within an album.
No one has yet to provide an accurate answer about the sorting algorithm/method used. Some people say to use iPhoto (I have a PC so I can't) which isn't an answer. Other people refer to editing some metadata. No one seems to be answering the main question:
What data is used to sort photos?
File Name (alphabetical) ?
File creation date?
File modified date?
Size?
Type?
Some (hidden) tag like an mp3 has?
It's gotta be something!
What is it?

Well, I figured it out.
It uses the Created Date to sort files.
On my PC, I use a freeware program called AttributeMagicFree
to change the created date and now sorting works as I expect.
http://www.elwinsoft.com/atm.html

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http://users.df.uba.ar/cobelli/LaboratoriosBasicos/excel97.pdf
[Ref 2]L. Knüsel. On the accuracy of the statistical distributions in Microsoft Excel 97. Computational Statistics & Data Analysis. Vol. 26 No. 3, pp 375-377. January 1998.
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[Ref 3]B. McCullough, B. Wilson. On the Accuracy of Statistical Procedures in Microsoft Excel 2000 and Excel XP.
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[Ref 4] B. McCullough, B. Wilson. On the Accuracy of Statistical Procedures in Microsoft Excel 2003.
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http://www.pucrs.br/famat/viali/tic_literatura/artigos/planilhas/msexcel.pdf
[Ref 5] L. Knüsel. On the accuracy of statistical distributions in Microsoft Excel 2003. Computational Statistics & Data Analysis, Vol. 48, No. 3, pp 445-449. March 2005.
http://www.sciencedirect.com/science/article/pii/S0167947304000337
[Ref 6]B. McCullough, D.Heiser. On the Accuracy of Statistical Procedures in Microsoft Excel 2007.
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http://users.df.uba.ar/mricci/F1ByG2013/excel2007.pdf
[Ref 7] A. Yalta. The Accuracy of Statistical Distributions in Microsoft<sup>®</sup> Excel 2007. Computational Statistics & Data Anlaysis. Vol. 52 No. 10, pp 4579 – 4586. June 2008.
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What algorithm is used to Sort Photos?

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