We should add day periods for Amharic for Ethiopia. They use a 12-hour clock there, but the day starts at the equivalent of 06:00am Gregorian time. That is, 12:00 morning Ethiopic = 06:00am Gregorian, and 6:00noon Ethiopic = 12:00pm Gregorian, etc.
The day periods are pretty consistent throughout the year because Ethiopia is right near the equator, so the day length does not vary very much.
Here are the periods:
ጠዋት - morning - 12:00 to 5:59 Ethiopic = 06:00 to 11:59 Gregorian
ቀትር - noon - 6:00 Ethiopic = 12:00 Gregorian (one minute long!)
ከሰዓት - afternoon - 6:01 to 11:59 Ethiopic = 12:01 to 17:59 Gregorian
ከምሽቱ - evening - 12:00 to 5:59 Ethiopic = 18:00 to 23:59 Gregorian
ከሌሊቱ - night - 6:00 to 11:59 Ethiopic = 00:00 to 06:00 Gregorian
These day periods are only used with the Ethiopic calendar dates and times. When giving times in Gregorian, you use the regular AM/PM meridiems, translated to Amharic:
ጠዋት - AM
ከሰዓት - PM