I assume you want several hours entered for each person, so this could get involved.
Make two tables.
Table1: Create a field for Name - I used Person, click the Yellow Key to make it the primary key.
Table2: Create a field for the name, I called my Person, don't make it a primary key, but Indexed, Duplicates OK.
Then put Date, data type date/time and then Hours data time Number
Now the forms:
New Form, Design View
Click Properties on the form and change Default view to Datasheet. In record source choose table2. Drag two fields onto the form, Date and Hours. Save the form, and use a name with 'Sub' in it, this will be the sub form for the entry form.
New Form, Design View (again)
Properties, Data, Record Source Table1 Drag the field onto the form. In the tool box click Subform. It is near an icon that looks like a file folder and near one that looks like a diagonal line (I'm in version 2000) Drag open a big box for the subform
Choose use existing form. (the one you name with "Sub")
Define link fields, Choose Person from Form Fields and link it to Person in subform fields. Next, Finish
When you open the form your cursor will be in the Person field, Click the binoculars to find the name of a person that is entered or enter a name for a new record.