Every resource in an organization uses a calendar to define working days and hours, as well as track events such as vacation, sick days, and personal days. A Resource calendar uses the Organization calendar as a base calendar. When new resources are added to an Organization, the default Organization calendar is assigned as their base calendar. You can switch the base calendar to any active calendar.
A resource's supervisor and members of the Resource standard group can edit the working days/times on a resource's personal calendar, as well as add events. The resource can add events only if the Can Edit Calendar attribute is set to Yes; resources are not permitted to change working hours. The resource's supervisor or a member of the Resource standard group can adjust this setting on the resource's Resource Info tab.
Resource calendars and allocations
A resource's capacity hours/week calculation is based on the Resource calendar's working days/hours. Resource calendars do not affect schedules or task dates. However, resources will appear over-allocated/overscheduled if they are allocated/scheduled on non-working days/time from their resource calendar. See Capacity and Calendars for more information.