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Convert Milliseconds to SQL datetime

How can I convert milliseconds into SQL datetime ?

I transfer the variable start & end like this:

 var interval = scheduler.GetSelectedInterval();
 var resourceId = scheduler.GetSelectedResource();
 var start = _aspxDateTimeToMilliseconds(interval.start);
 var end = _aspxDateTimeToMilliseconds(interval.end);
 window.location.href = 
    "FicheAgenda.aspx?Page=ACTION&Mode=Creation&start=" + 
         start + "&end=" + end +"&resourceId=" + resourceId;

the output:

FicheAgenda.aspx?Page=ACTION&Mode=Creation&start=1334579400000&end=1334584800000&resourceId=24

and on FicheAgenda.aspx I want to convert this start & end value into a datetime

     <asp:SqlDataSource ID="SqlDataSource_Activity" runat="server" 
        ConnectionString="<%$ ConnectionStrings:OnyxConnectionString %>" 
        SelectCommand="SELECT DISTINCT [ID_ACTIVITE], [LIBELLE_ACTIVITE]
                       FROM [ESPTEMPS_ACTIVITE]
                       LEFT JOIN ESPTEMPS_PROGRAMMATION
                ON ESPTEMPS_ACTIVITE.ID_ACTIVITE = ESPTEMPS_PROGRAMMATION.ID_ACTIVITY
                        WHERE DATEADD(MINUTE, 
                                CONVERT(int, SUBSTRING(HEURE_DEBUT, 3, 2)), 
                                DATEADD(HOUR, 
                                  CONVERT(int, SUBSTRING(HEURE_DEBUT, 1, 2)), 
                                   DATE_DEBUT))
                               < convert(datetime,@StartDate)
                        AND
                              DATEADD(MINUTE, 
                                CONVERT(int, SUBSTRING(HEURE_FIN, 3, 2)), 
                                DATEADD(HOUR, 
                                  CONVERT(int, SUBSTRING(HEURE_FIN, 1, 2)), DATE_FIN))
                              > convert(datetime,@EndDate) ">
 <SelectParameters>
    <asp:QueryStringParameter Name="StartDate" QueryStringField="start" />
     <asp:QueryStringParameter Name="EndDate" QueryStringField="end" />
 </SelectParameters>             
 </asp:SqlDataSource>

Use the dateadd function, for example:

dateadd(ms, start, '19800101')

where 1980-01-01 would be the "zero" date that you use in your _aspxDateTimeToMilliseconds method.

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