Wolfram Technology Guide: Automatic Data Integration  previous | next 
Import Time Series in Many Formats
Mathematica supports many time series formats, here one from electrophysiology.
In[1]:=

Click for copyable input
ListLinePlot[

 Import["ExampleData/osas.edf.gz", {"RecordsData", 12, 1}], 

 PlotRange -> All]
Out[1]=