SQL Server - MyCTE query based on 24 hour period (next day) -

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i have bit of code:

;with mycte (     select *,            row_number() over(partition carduser order cardtableid) newvariation       cardchecker ) update mycte  set    status = newvariation

which updates status column, want happen on 24 hour period, status starts again next day @ 1, , counts again based on carduser specified above:

current data , happens: 

2   aaa 1   2015-06-25 08:00:00.000 123 1   null 3   ccc 1   2015-06-25 00:00:00.000 124 1   null 4   aaa 1   2015-06-25 17:30:00.000 125 2   null 5   aaa 1   2015-06-26 17:30:00.000 125 *3* null

what want happen: 

2   aaa 1   2015-06-25 08:00:00.000 123 1   null 3   ccc 1   2015-06-25 00:00:00.000 124 1   null 4   aaa 1   2015-06-25 17:30:00.000 125 2   null 5   aaa 1   2015-06-26 17:30:00.000 125 *1* null

im not quite sure how add above query possible point me in right direction?

the main problem eventtime field contains both date , time, adding partition means status 1 based on time parameter of field

thanks help

current cardtable structure:

create table cardtable (cardtableid int identity (1,1) not null, carduser varchar(50), cardnumber varchar(50), eventtime datetime, status int)

you can convert() eventtime date type , partition:

;with mycte (     select status,            row_number() over(partition carduser, convert(date, eventtime)                               order cardtableid) newvariation       cardchecker ) update mycte  set    status = newvariation

your query unnecessarily updating entire table everytime. if eventtime current date time of system, having flag mark updated status improve performance.

;with mycte (     select status,            row_number() over(partition carduser, convert(date, eventtime)                               order cardtableid) newvariation       cardchecker      status null or            convert(date, eventtime) = convert(date, getdate()) ) update mycte  set    status = newvariation

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