How to convert period in milisecond to minutes / seconds , hour etc

Do you need the result to be in a time type? If it’s of some numeric type but represents milliseconds then just do the conversion. seconds = delta/1000

If you really need it in a time type then you can extend your other question.

julia> t1 = map((x) -> convert(DateTime,x),events[:,1])
julia> t2 = map((x) -> convert(DateTime,x),events[:,2])
julia> delta = t2 - t1
10-element Array{Base.Dates.Millisecond,1}:
 75631000 milliseconds 
 6031000 milliseconds  
 13531000 milliseconds 
 12685000 milliseconds 
 632000 milliseconds   
 21631000 milliseconds 
 212430000 milliseconds
 30000 milliseconds    
 30000 milliseconds    
 30000 milliseconds 

or

julia> time = map((x) -> convert(DateTime,x),events)
10×2 Array{DateTime,2}:
 2016-04-01T22:00:44  2016-04-02T19:01:15
 2016-04-01T12:00:27  2016-04-01T13:40:58
 2016-04-01T14:43:50  2016-04-01T18:29:21
 2016-04-01T08:29:33  2016-04-01T12:00:58
 2016-04-01T22:53:45  2016-04-01T23:04:17
 2016-04-01T22:53:44  2016-04-02T04:54:15
 2016-04-01T02:59:52  2016-04-03T14:00:22
 2016-04-01T17:26:38  2016-04-01T17:27:08
 2016-04-01T17:32:34  2016-04-01T17:33:04
 2016-04-01T17:24:58  2016-04-01T17:25:28

julia> time[:,2] - time[:,1]
10-element Array{Base.Dates.Millisecond,1}:
 75631000 milliseconds 
 6031000 milliseconds  
 13531000 milliseconds 
 12685000 milliseconds 
 632000 milliseconds   
 21631000 milliseconds 
 212430000 milliseconds
 30000 milliseconds    
 30000 milliseconds    
 30000 milliseconds