У вашего броузера проблема в совместимости с HTML5
Source Codes:
https://codeloop.org/category/pyqt5/
PyQt5 Date And Time
QDate, QTime, QDateTime
PyQt5 has QDate, QDateTime, QTime classes to work with date and time. The QDate is a class for working with a calendar date in the Gregorian calendar. It has methods for determining the date, comparing, or manipulating dates. The QTime class works with a clock time. It provides methods for comparing time, determining the time and various other time manipulating methods. The QDateTime is a class that combines both QDate and QTime objects into one object.
Current date and time
PyQt5 has currentDate(), currentTime() and currentDateTime() methods for determining current date and time.