Yes it can! Blub Uno can display both 12-hour and 24-hour time formats, with a 'hide the zero' option on both. For example if the time is 8:00am, you could choose the display to read '08 00' or just '8 00' (hiding the zero).
The tube should last you several years, and there are spares available. Changing a tube is easy, just pull the old one out and push the new one in. It takes less than 10 seconds and doesn't require any tools!
Blub Uno will always be keeping track of the time when it is plugged in, but you can choose to turn the display on or off as you like using the remote control. For example, if you're using the clock in your bedroom and the glowing numbers are a bit distracting at night, or you're going away on holidays, you can simply put Blub Uno in 'sleep' mode where the display and backlighting will shut off but it will continue to keep time. Waking up the display is just as easy!
The time is easy to set using the Blub Uno infrared remote. Using the numbers on the remote, the time can literally be 'typed' in. For example, to set the time as 10:45am, you would go to the time setting, press '1' then '0' then '4' and then '5'. Easy! Every Blub Uno will come with a full set of instructions to make settings a breeze.