Compare Date portion of Datetime in SQL -

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i working sql , have 2 columns datetime field.
want compare date portion of these datetime fields , see if there different.

for example,

          col1                     |    col2 '2010-01-02 23:58:00.000'          | '2010-01-03 06:21:00.000'  '2010-01-04 16:03:00.000'          | '2010-01-04 21:34:00.000'

row1's dates different row2 same

i thinking datediff(day,col2,col1) < 1 //then different else same.

not sure how parse date compare 2 fields.

abs(datediff(day, col1, col2)) > 0

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