I was searching for software which would do pretty much the same thing and found this page.
Handy to have up for quick time checks, easy to use…
TimeTicker and the time tickers…
Hope it helps someone!
- Z
Qlock - World Clock
download the free one. stays on your desktop and you can set multiple alarms 
Classy. Much appreciated.
- Z
Since it’s on the table, I’ve gotten a lot of use out of Oanda’s “FXMarketHours” widget. It tells you when all the major FX markets open and close, and does all that daylight savings adjustments that would drive me crazy if I had to think about that stuff!
my apologies :o