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Posted 6 Aug 2007

Seagate Date Code Calculator

, 6 Aug 2007
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How to get the date 20 November 2005 from the number 06212.

Screenshot - SeagateDateCode.jpg


The code described in this article helps users convert Seagate's (the hard drive manufacture) date code to a DateTime value.

This article is based on this documentation.


I had to check some hard drives for warranty, and found myself checking very old hard drives.

The code

Here is the actual code invloved:

Class variables

private DateTime datecalc;
private string _datecode;

Class properties

public string DateCode
    get { return _datecode; }
        int _CodeYear = 0;
        byte _CodeWeek = 0;
        byte _CodeDayOfWeek = 0;
        _datecode = value;
        if (_datecode.Length == 5)
            //Get the number of weeks to add
            _CodeWeek = Convert.ToByte(_datecode.Substring(2, 2));
            //Get the day of the week in the final week
            _CodeDayOfWeek = Convert.ToByte(_datecode.Substring(4));
        else if (_datecode.Length == 4)
            //Get the number of weeks to add
            _CodeWeek = Convert.ToByte(_datecode.Substring(2, 1));
            //Get the day of the week in the final week
            _CodeDayOfWeek = Convert.ToByte(_datecode.Substring(3));
        if (_datecode.Length == 4 || _datecode.Length == 5)
            _CodeYear = (2000 + Convert.ToInt32(_datecode.Substring(0, 2)) - 1);
            datecalc = new DateTime(_CodeYear, 7, 1);
            do { datecalc = datecalc.AddDays(1); } 
            while (datecalc.DayOfWeek != DayOfWeek.Saturday);
            datecalc = datecalc.AddDays((_CodeWeek * 7) + _CodeDayOfWeek);

public DateTime CalculatedDate
    get { return datecalc; }

Class constructors

public SeagateDateCodeCalc()

public SeagateDateCodeCalc(string dateCode)
    this.DateCode = dateCode;


This is my first submission here, so let me know if I am missing anything.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

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Comments and Discussions

QuestionThank You! Pin
Jason Bradley Smith13-Nov-14 15:24
memberJason Bradley Smith13-Nov-14 15:24 
AnswerRe: Thank You! Pin
Paw Jershauge19-Nov-14 6:08
professionalPaw Jershauge19-Nov-14 6:08 
GeneralRunning the prog Pin
gimmegimme8-Oct-08 12:00
membergimmegimme8-Oct-08 12:00 
GeneralRe: Running the prog Pin
Paw Jershauge9-Oct-08 3:42
memberPaw Jershauge9-Oct-08 3:42 
GeneralRe: Running the prog Pin
icefloe018-Jan-09 5:37
membericefloe018-Jan-09 5:37 
GeneralRe: Running the prog Pin
Paw Jershauge8-Jan-09 11:14
memberPaw Jershauge8-Jan-09 11:14 
GeneralRe: Running the prog Pin
icefloe018-Jan-09 12:40
membericefloe018-Jan-09 12:40 
Please don't get the wrong impression, I wasn't trying to bash you. I spent a LOT of time trying to organize my thoughts so that I would not come across that way. I was just trying express why I thought they said what they said. I had also spent quite some time (30-45 min) trying to find a simple solution to decoding the Seagate date code when Google popped up your project. I had some ideas in mind for an Excel spreadsheet to do it and was about to pursue that when codeproject popped up. I actually had Visual Studio Express installed (hadn't gotten around to learning it yet) when I had XP Pro installed. I haven't downloaded the latest version since upgrading to Vista Ultimate 64, but I do want to get into programming sometime this year as it will help out quite a bit at work too. Once again, I apologize if I came across as harsh, that was not my intent. Smile | :)
GeneralRe: Running the prog Pin
Knight of Cydonia11-Jan-09 13:37
memberKnight of Cydonia11-Jan-09 13:37 
GeneralRe: Running the prog Pin
Paw Jershauge12-Jan-09 0:47
memberPaw Jershauge12-Jan-09 0:47 
GeneralRe: Running the prog Pin
Knight of Cydonia12-Jan-09 9:29
memberKnight of Cydonia12-Jan-09 9:29 

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