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We have prepared the Aurelia sample to custom work week days which can be viewed from the below location. Kindly use the below code example to overcome the reported issue.
<Code>
App.html
<ej-schedule id="Schedule1" e-width="100%" e-height="525px" e-work-week.bind="WorkWeek" e-appointment-settings.bind="AppointmentList" e-current-date="04/03/2016">
</ej-schedule>
App.ts
this.WorkWeek = ['Sunday', 'Monday', 'Tuesday', 'Friday', 'Saturday'];
</Code>
Regards,
Karthigeyan