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The difference between two dates can be calculated by subtracting the Julian day number of one from that of the other , or there are simpler formulae giving ( for instance ) the number of days since December 31 , 1899 .
 time: Julian day number
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Julian day number 
Answer:
 time: Julian day number