Do Tamagotchi toys calender recognize when there is a Leap Year, because if not and you started your Tamagotchi in February, the date after February would be incorrect.
All Tamas include the extra day, and count it every year (since they don't distinguish between years).
Why? Because they have no idea whether it's a leap year or not. If it is, the date works perfectly. However, can you imagine the trouble tama users would go through if it was a leap year and their pet's calendar simply didn't include a February 29th? Either they would have to set the date back to the 28th for an additional day, or observe two March 1sts in the same fashion. Because the 29th is included, if it is NOT a leap year, all you have to do on the 1st of March is set the clock forward to the correct day. Much easier.