How do I write a SQL query involving a time stamp?

QUOTE_ID is a character string
CREATE_DTG is a date time type
RETENTION_LEAD_TRACK is a table

This sql statement cmf.CommandText = "SELECT QUOTE_ID FROM RETENTION_LEAD_TRACK where CREATE_DTG > '2016 - 04 - 25 18:18:15.2891'"

throws this error {"Conversion failed when converting date and/or time from character string."}