Zoho Mail downloading via POP

My Zoho POP/IMAP Settings panel shows the following option:

" Enable for Messages that arrive from "02/06/2013" Onwards"

I would like to use that option, to avoid downloading a vast number of messages from the past.

However, I only want to download from September 2014 instead of June 2013 as the text in the option displays.

Question: How can I change the date shown on the Settings panel, so I only download messages from last month?

Thanks for any help.
Masr

PS: Yes I do realise that I can download msg headers instead of full msg content, but I STILL only want headers from last month onwards, instead of from more than a year ago.