As you have asked about the E Litmus pH test dates for the month of May, I have found following information

Location Test date Last date to Apply
15th May
Lucknow 15th, May 10th, May
Mumbai 15th, May 11th, May
Bangalore 15th, May 12th, May
Chennai 15th, May 12th, May
Delhi 15th, May 12th, May
Hyderabad 15th, May 12th, May
Kolkata 15th, May 12th, May
Pune 15th, May 12th, May
22nd May
Bhopal 22nd, May 17th, May
Chandigarh 22nd, May 17th, May
Cochin 22nd, May 17th, May
Coimbatore 22nd, May 17th, May
Durgapur 22nd, May 17th, May
Mangalore 22nd, May 17th, May
Nagpur 22nd, May 17th, May
29th May
Lucknow 29th, May 24th, May
Mumbai 29th, May 25th, May
Bangalore 29th, May 26th, May
Chennai 29th, May 26th, May
Delhi 29th, May 26th, May
Hyderabad 29th, May 26th, May
Kolkata 29th, May 26th, May
Pune 29th, May 26th, May