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This app will work on the Google TV,this is the Amazon free app of the day.
This app requires a side load

Need to convert between a week number and a date? With this app you can. Want some information about a date, find out if a year is a leap year, calculate the number of days, working days (business days), weeks, months and years between two dates and add or subtract days, weeks or months to a given date? With TKWeek, it‘s no hassle.

Google Play link.