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Indicates whether the system is currently using the 24-hour mode. When the system is in 24-hour mode, this view will use the pattern returned by TextClock.Format24HourFormatted. In 12-hour mode, the pattern returned by TextClock.Format12HourFormatted is used instead. If either one of the formats is null, the other format is used. If both formats are null, the default formats for the current locale are used.