From DataFrameTime—Help | ArcGIS Desktop, the following example exports each "Time Frame" as a unique file:
<SPAN class="keyword token">import</SPAN> arcpy
<SPAN class="keyword token">import</SPAN> os
mxd <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mapping<SPAN class="punctuation token">.</SPAN>MapDocument<SPAN class="punctuation token">(</SPAN>r<SPAN class="string token">"C:\Project\Project.mxd"</SPAN><SPAN class="punctuation token">)</SPAN>
df <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mapping<SPAN class="punctuation token">.</SPAN>ListDataFrames<SPAN class="punctuation token">(</SPAN>mxd<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Traffic Analysis"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>currentTime <SPAN class="operator token">=</SPAN> df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>startTime
<SPAN class="keyword token">while</SPAN> df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>currentTime <SPAN class="operator token"><=</SPAN> df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>endTime<SPAN class="punctuation token">:</SPAN>
<SPAN class="comment token"># An example str(newTime) would be: "2008-12-29 02:19:59"</SPAN>
<SPAN class="comment token"># The following line splits the string at the space and takes the first </SPAN>
<SPAN class="comment token"># item in the resulting string. </SPAN>
fileName <SPAN class="operator token">=</SPAN> str<SPAN class="punctuation token">(</SPAN>df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>currentTime<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>split<SPAN class="punctuation token">(</SPAN><SPAN class="string token">" "</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">+</SPAN> <SPAN class="string token">".png"</SPAN>
arcpy<SPAN class="punctuation token">.</SPAN>mapping<SPAN class="punctuation token">.</SPAN>ExportToPNG<SPAN class="punctuation token">(</SPAN>mxd<SPAN class="punctuation token">,</SPAN> os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>r<SPAN class="string token">"C:\Project\Output"</SPAN><SPAN class="punctuation token">,</SPAN> fileName<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> df<SPAN class="punctuation token">)</SPAN>
df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>currentTime <SPAN class="operator token">=</SPAN> df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>currentTime <SPAN class="operator token">+</SPAN> df<SPAN class="punctuation token">.</SPAN>time<SPAN class="punctuation token">.</SPAN>timeStepInterval
<SPAN class="keyword token">del</SPAN> mxd<SPAN class="line-numbers-rows"><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN></SPAN>
From Migrating from arcpy.mapping to ArcGIS Pro—ArcPy | ArcGIS Desktop I see
p <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mp<SPAN class="punctuation token">.</SPAN>ArcGISProject<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"CURRENT"</SPAN><SPAN class="punctuation token">)</SPAN>
m <SPAN class="operator token">=</SPAN> p<SPAN class="punctuation token">.</SPAN>listMaps<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Yosemite National Park"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
<SPAN class="keyword token">for</SPAN> lyr <SPAN class="keyword token">in</SPAN> m<SPAN class="punctuation token">.</SPAN>listLayers<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
<SPAN class="keyword token">if</SPAN> lyr<SPAN class="punctuation token">.</SPAN>supports<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"SHOWLABELS"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
lblClasses <SPAN class="operator token">=</SPAN> lyr<SPAN class="punctuation token">.</SPAN>listLabelClasses<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN></SPAN>
as an example of how to access the map part, but I'm not seeing any documentation or examples on how to access the time property, if a Pro map has a time-enabled layer. In context, I'm working Working with a multidimensional raster layer—ArcGIS Pro | ArcGIS Desktop where I have some 100 rasters, each with a time stamp, and I want to export each "Step" as it's own JPEG.