Ignore Time Portion Of Datetime Field

I have a PHP page where the user enters a date that represents the last day of a timesheet (ts_end) and the hours worked on that timesheet. That is then written into a table where the date is a datetime type. Because the user just enters a date, the time portion of the field is set to 00:00:00. In another place, I need to sum the columns for reports submitted between the beginning of a timesheet (ts_end -6 days) and the ts_end date.

The problem is that chartreviewed values entered on the ts_end date are getting lost because the time part of the ts_end field is 00:00:00 and the time part of the dateentered for the chartreviewed value is not. For instance using 2/4/2004 as the ts_end date looses the 192 charts.

Reporter activity chartsdateentered
2001576 20672 563 2004-01-29 13:55:51.000
2001576 20665 202 2004-02-02 19:54:57.000
2001576 20666 160 2004-02-03 22:48:11.000
2001576 20667 192 2004-02-04 19:41:51.000

I know I can revise the query to look for charts where the dateentered is less than dateadd(d,1,ts_end) and get the right values. It seems like there has to be a way though to tell sqlserver to ignore the time part of a datetime field when querying.

Anybody know what it is?

Thanks,
Ursus