Here's how I added the timestamps and labels to the JPEG's using IRFANVIEW

1.  Open one of the photos with IrfanView
2.  Press 'b' for the Batch conversion dialog
3.  Press 'Add All' to get all your photos in the batch queue
       I started with just a couple of examples to get things looking right 
4.  Check the 'Output format' to be what you want it to be - I use /tmp/irfanview
5.  Select an output directory 
6.  Activate 'Use advanced options' and press 'Advanced' to pull up new page
7.  Probably no changes/clicks except Apply to all pages
8.  Pick 'Add overlay text' and press 'Settings' to pull up new page
9.  Select x,y position, start corner, alignment, font size & color
10. Type in text - some special option available to get data from EXIF, etc.
11. Optionally save as a profile
12. Click OK, OK.
13. Start Batch
14. Look at images in irfanview and then iterate until you are happy


HH:MM:SS TimeStamp on Lower Right is $E36867(%H:%M:%S)
X is 10,300 ... y is 10,100 ... left bottom ... RGB is 0,255,00 ... Font is bold Fixedsys 28

May 20th, 2012 partial Solar Eclipse setting
over the Colorado Rockies - www.komar.org
x is 10,700 ... y is 10,400 ... right top - RGB is 255,135,0 ... Font is bold Times New Roman 28 

NE of Boulder at Niwot Road & 287 - 40.102N/105.103W
Canon 7D at 400mm with cut-out from Eclipse Glasses
Very cloudy evening - sun came out at very last minute
x is 10,700 ... y is 10,400 ... right bottom - RGB is 255,135,0 ... Font is bold Times New Roman 20