The "Project" drop-down list on the Time log page contains projects where current user:

• participates and has either «Time entries - Add own» or «Time entries - Add for someone else» permissions;
• doesn't participate but has the permission «Time entries - Add for someone else» in his global role, in the "Permissions for projects where user is NOT a member" section.

The "Activity" drop-down list contains activities if either of the following conditions is met:

• current user is not a project member but has the «Time entries - Add for someone else» permission in his global role, in the "Permissions for projects where user is NOT a member" section. He is not the activity assignee but at least one project member is assigned to the activity;
• current user is a project member and has the «Time entries - Add for someone else» permission in the project. He is not the activity assignee but at least one project member is assigned to the activity;
• current user is a project member and assigned to the activity.