This logo was used for the iPhone and iPod Touch from iPhone OS 1 in June 2007 to iOS 5 in August 2012.
The logo on the right was only used for the iPhone and iPod Touch during iOS 6 in September 2012 The minute and hour hands were rounded as opposed to pointy in iOS 5 and below.
2012-2013 (iPad Only)
The logo on the left was only used for the iPad during iOS 6 in September 2012.
This logo was used since the launch of iOS 7 in September 2013. The new clock icon acts as a real clock based the time of the device. In iOS 8.0 to 8.2, the minute and hour hands were bolder and longer. In iOS 8.3 to iOS 8.4.1, the minute and hour hands lost their boldness, but were the same length as before.
This logo is used since the launch of iOS 9 in 2015. In 2016 with iOS 10, the seconds hand turned from red to orange. In iOS 11, the numbers of the clock face became bolder to match iOS 11's UI.
This logo is used since the launch of iOS 11 in 2017. Apple use the new font and change the color of the second hand.
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