CurrentTime - This function will return the current time in the STIX
time stamp format, which is in RFC 3339 format. The options are "milli",
"micro", or "" which will give you to the second.
Valid - This function will return true if the time stamp is a valid STIX
time stamp, just the date in proper RFC3339 format, or just the year. If it
is anything else it will return false.