In the year Jiawu, in the month Yihai, in the day Bingwu, in the hour Dingyou, what is missing from the five elements?

Gregorian calendar: 18:00 on December 1, 2014 (Monday)

Lunar calendar: Unity hour on the tenth day of October in the year Jiawu

Eight characters: Jiawu, Yihai, and Bingwu Ding You

Five Elements: Wood, Fire, Wood, Water, Fire, Fire, Metal

What is missing from the Five Elements: Earth

Zodiac: Horse