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Dashclock Weeknum Extension is an extension for the Dashclock Widget that displays information about the current week number in your device's locale.
This extension is free to use when used alone but when used simultaneously with other extensions made by this developer, a small one-time purchase is required to unlock them all.
This application is entirely open-source. If you'd like to have new features or additional languages/locales please raise an issue ticket at https://github.com/mridang/dashclock-weeknum or create a patch and send me a pull-request (if you're adventurous enough).
This extension requires the requires the Dashclock Widget by Roman Nurik: https://play.google.com/store/apps/details?id=net.nurik.roman.dashclock