later vs modern-day

later

• At some time in the future. 

• Coming afterward in distance (following an antecedent distance as embedded within an adverbial phrase) 

• Coming afterward in time (used with than when comparing with another time). 

• Afterward in time (used with than when comparing with another time). 

• At some unspecified time in the future. 

• See you later; goodbye. 

modern-day

• Current; of the present. 

• Designating a present-day version of someone or something in history.