The cardinal number occurring after seven hundred ninety-nine and before eight hundred one, represented in Arabic numerals as 800.

The start of the eighteenth hour of the day on the 24-hour clock i.e. 17:00. / The number one thousand seven hundred. / The year 1700.

The number one thousand eight hundred. / The start of the nineteenth hour of the day on the 24-hour clock i.e. 18:00. / The year 1800.

The start of the sixteenth hour of the day on the 24-hour clock i.e. 15:00. / The number one thousand five hundred. / The year 1500.

The start of the twenty-third hour of the day on the 24-hour clock i.e. 22:00. / The number two thousand two hundred. / The year 2200.

The start of the twenty-second hour of the day on the 24-hour clock i.e. 21:00. / The number two thousand one hundred. / The year 2100.

The start of the last hour of the day on the 24-hour clock i.e. 23:00. / The number two thousand three hundred. / The year 2300.

The number one thousand four hundred. / The year 1400. / The start of the fifteenth hour of the day on the 24-hour clock i.e. 14:00.

The start of the first hour of the day on the 24-hour clock, i.e. 0:00, military time.

The start of the twenty-first hour of the day on the 24-hour clock, i.e. 20:00.