Here's an example using javascript to get the current timestamp and use that value for the variable ("codigo" in this example):
storeEval
new Date()
today
storeEval
storedVars['today'].getTime()
codigo
type
bsa.olbServiceId
${codigo}
echo
Codigo is ${codigo} for WOV Everything
Below, I needed to generate random usernames that were 6-20 characters with letters and numbers. I used Javascript to get the current timestamp, converted it to a string, then contatenated with 'usr':
storeEval
new Date()
today
storeEval
storedVars['today'].getTime()
numtime
storeEval
storedVars['numtime'].toString()
time
storeEval
['usr']+storedVars['time']
username
echo
${username} is the username.
More info on Javascript and Selenese is in the Selenium documentation.