SQL Query JOIN Needed? Too Advanced For Me

THIS LOOKS LIKE A LOT BUT I JUST WANTED TO GIVE ALL INFORMATION NEEDED FOR YOU TO EASILY ASSIST ME.  I am not good with SQL so please bare with me. 
I will give a dumbed down table for us to work with:
timestamp          -   DATA1 - DATA2 - MAXVALUENEEDED - DATA3
2006/8/12 12:00       123         125             1289                      121 
2006/8/12 12:05       124         128             1291                      123
2006/8/15 12:00        130        128              1190                     124
2006/8/15 1:00          131        127             1196                      123 
 The columns labeled DATA do not really matter.  The only important ones are timestamp and MAXVALUENEEDED but I do need the query to return all columns.
 What the query has to do: The query needs to find the MAX of MAXVALUENEEDED for a given DAY. 
Example Output-
 2006/8/12      124   128   1291   123
2006/8/15      131   127   1196   123
As you can see the MAX values were grabbed for each given day and the unique records were returned on a per day basis.
 
My current SQL Query is:  SELECT CONVERT(varchar, timestamp, 101) AS Time, CONVERT(int,LV50AEPM_AMPS_A_VAL0) AS AMPS_A, CONVERT(int,LV50AEPM_AMPS_B_VAL0) AS AMPS_B, CONVERT(int,LV50AEPM_AMPS_C_VAL0) AS AMPS_C,
CONVERT(int,LV50AEPM_KVA_TOT_VAL0) AS KVA_TOTAL, CONVERT(int,LV50AEPM_KW_TOT_VAL0), CONVERT(int,LV50AEPM_VLL_CA_VAL0), CONVERT(int,LV50AEPM_VLL_BC_VAL0), CONVERT(int,LV50AEPM_VLL_AB_VAL0)
FROM Table_1 T1
WHERE CONVERT(int,T1.LV50AEPM_KVA_TOT_VAL0) = (SELECT MAX(CONVERT(int,T2.LV50AEPM_KVA_TOT_VAL0)) FROM Table_1 T2 WHERE CONVERT(varchar,T1.timestamp,101) = T2.timestamp)
ORDER BY Time ASC The problem is it only returns the max value for one day instead of all days.  Can anyone help me correct this?  Thanks in advance for your help.