The tenth century spans the years from 901 - 1000. Note that not all people agree on this, and many believe that 1000 is the first year of the eleventh century; but if you count 100 years at once, starting at year 1, the situation is quite clear: the 1st. century is from 1-100, the 2nd century is from 101-200, etc.
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999 is the final year of the 10th century 1000 is the first year of the 11th century.
The 20th century. We add 1 to the first two digits to get the century. This is since the first century is classed as the years 0 to 999, the 2nd century the years 1000 to 1999 etc.
The 11th century 0-99 is 1st century 100-199 2nd century 200-299 3rd century .. .. .. .. 900-999 10th century 1000-1099 11th century .. .. .. .. 1900-1999 20th century 2000-2099 21st century
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86400 seconds in a day.365 x 86400 = 31536000 seconds in a year.100 x 31536000 = 3153600000 seconds in a century.1000 x 3153600000 = 3153600000000 milliseconds in a century.