gnucash/Docs/xacc-date.html

<h1>Date Input</h1>

The date cell handles the following accelrator keys:
<pre>
       '+':
       '=':     increment day 

       '_':
       '-':      decrement day 

       '}':
       ']':      increment month 

       '{':
       '[':      decrment month 

       'M':
       'm':     begining of month 

       'H':
       'h':     end of month 

       'Y':
       'y':     begining of year 

       'R':
       'r':     end of year 

       'T':
       't':     today 

</pre>