a.m.

The stripped-back Storm Elexo gives this gadget watch an 80s look, with a 12-hour clock, date and month functions, an LED-o-vision and an alarm.

To convert the 24-hour clock back to the 12-hour clock, just subtract 1200 from the p.m.

He writes: "It alone has no website; it alone uses the 12-hour clock; and it alone publishes no maps.

She said: "I am asking people to guess which of 720 minutes the 12-hour clock will stop.

"H" or "HH" means a 24-hour clock, "h" or "hh" is a 12-hour clock, and "tt" is used to denote an a.m./p.m.