You are unable to log hours for future dates on projects, tasks, or issues because the fields are disabled.
The system administrator can determine whether you are able to log hours for future dates within timesheets.
Contact your Adobe Workfront administrator.
System administrators can update this setting as follows:
Click the Main Menu icon in the upper-right corner of Adobe Workfront, then click Setup .
Expand Timesheets & Hours, then click Preferences.
In the General Preferences section, select the Log hours for future dates.
For more information about this and other option regarding timesheets and hours, see Configure timesheet and hour preferences.