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Settings > apps > all > scroll to the bottom > look if you have disable any app
I have disabled apps, but none is related to clock widget. Disabled e.g.: google drive, dynamic wallpapers, evernote, chrome... But nothing with clock. It worked fine till my first phone restart (11 days since buying)
enable all the apps and check again.
Didn't helped. But I uninstall updates from clock widget app and they've showed up again. But now, how can I get update of clock widget back? Update center found nothing.
restart your phone and check again
What is the built no. of updated clock widget? Mine is 4.0.A.0.7 (for Z3 kitkat 4.4.4)