This site offers many free math games that allow you to practice time calculations and conversions in days, hours, minutes and seconds.
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Time conversion game (time) : This game allows you to practice making conversions on days, hours, minutes, seconds (d, h, min, s).
Duration calculation game (time) : This game on time calculations allows to practice manipulating durations expressed in days, hours, minutes, seconds (d, h, min, s).
The little math quiz (time) : The little math quiz collects a set of small fun math exercises to do online for 7-11 year olds.
Time conversion game (time)
Duration calculation game (time)
The little math quiz (time)