In a mixer jar add dates,sugar and make a paste then add tamarind extract to it.
Add salt and chatmasala and grind to a smooth paste.
Now transfer this to a pan add chilli-powder and let it boil(can add some water and boil) for some time till a shiny liquid forms.
switch off the stove and store.
Notes
Procedure for making this chutney differs from place to place,but I feel this as the easiest way.
Instead of jaggery I have used sugar you can very well use jaggery.
shelf life for this chutney is more so you can make it well in advance and store.