CURDATE() Returns the current date, Synonym: CURRENT_DATE()
CURTIME() Returns the current time as a string or an integer, depending on the context, e.g., '23:59:59' or 235959 (integer). Synonym: CURRENT_TIME()
NOW() Returns the current time in the form '2005-12-31 23:59:59'. Synonyms: CURRENT_TIMESTAMP(), LOCALTIME(), LOCALTIMESTAMP(), SYSDATE()
UNIX_TIMESTAMP() Returns the current system time as a Unix timestamp (32-bit integer).
UTC_DATE() Returns the date in Coordinated Universal Time.
UTC_TIME() Returns the time in Coordinated Universal Time.