Basic use cases

As an employee, I want to authorize to the tracking system.
As an employee, I want to take PTO.
As an employee, I want to notify about absence in the office.
As an employee, I want to mention about extra working day.
As an employee, I want to request a vacation.
As a team leader, I want to confirm extra working day of teammate.
As an accountant, I want to view monthly report.
As an accountant, I want to apply accounting calendar for particular country.

Features

Must have

Tracking missed or extra working days
LDAP Authentication
Easy management of company annual calendars (localized per country)
Calendars management
Simple tabular reports
Admin web interface to manager users, teams, etc
Notifications

Nice to have

Simple role based access control
Employee office arrangement
Search of free workplaces
Search of users/teams/calendars/events
Birthday calendar
Reminders
Calendar links for sharing
Import calendars/events from Google Calendar
Import from Attlasian Confluence Calendars
Export to CSV, iCalendar document formats