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Editorial Team
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Asked: 2026-05-25T12:39:48+00:00

Challenge: convert a ‘modified date’ DateTime of an image file to a version number

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Challenge: convert a ‘modified date’ DateTime of an image file to a version number / string suitable for maintaining uniqueness in a url, so each modification of the image generates a unique url, the version number/string to be as short as possible.

The shortness of code is secondary to the shortness of number/string
Apologies if this does not really qualify for code-golf status 🙂

Requirements

  • C#, .Net framework v4
  • output must be valid characters for a folder-name in a url.
  • DateTime precision can be reduced to nearest minute.

EDIT: this is not entirely theoretical / Puzzle, so I guess I’d rather keep it here than on code-golf stack exchange?

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1 Answer

  1. Editorial Team

    Use the DateTime.Ticks property and then convert it to a base 36 number. It’ll be very short and usable on a URL.

    Here’s a class for converting to/from Base 36:

    http://www.codeproject.com/KB/cs/base36.aspx

    You could also use base 62, but not base64 since one of the extra digits in base 64 beyond numbers and letters is + which needs to be url encoded and you said you wanted to avoid that.

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