What time is it anywhere in the world right now? I used this site so often over the years - it's just great how easy it is to plan virtual meetings with several parties across the globe.
ShowMeUK offers interactive science games as well as some on history and other subjects
Digital Clocks vs Analogue Clocks in this time telling maths game
Just In Time offers a great selection of learning activities concerning telling and measuring time
Learning About Time isn’t just a young childs introduction to time but also provides a detailed history of time as well which could be useful for older children.
An online stopwatch that you can use for all sorts of activities in class
Excellent series of games to practice maths - well worth buying although these run with a "sample" watermark.
Interactive Game that teaches time to kids!