When talking about a historical civilization/event that continues today, how do you write the "end" dates? [duplicate]

Solution 1:

On resumes, the most common way to indicate that a period is ongoing is either

2009 – present
or
2009 to present

The en dash is the preferred punctuation. Many word processors replace a double hyphen with an en dash once the next word is typed.

Solution 2:

In What is the correct abbreviation of “continued”?, absurd forms like

Example Co.  ABC Manager    2012 - cont.  
Example Co.  ABC Manager    2012 - (continued)

with hyphens were suggested, besides better forms (with en dashes) like

Example Co.  ABC Manager    2012 forward  
Example Co.  ABC Manager    2012 – present  
Example Co.  ABC Manager    2012 –
Example Co.  ABC Manager    2012 to date
Example Co.  ABC Manager    2012 to present
Example Co.  ABC Manager    2012–now