function current_time() returns time
function current_time(time_zone string) returns time
function format_time(string, time) returns string
function parse_time(string, string) returns time
function time(int64, int64, int64) returns time
function time(timestamp) returns time
function time(timestamp, time_zone string) returns time
function time(datetime) returns time
function time_add(time, interval microsecond to hour) returns time
function time_diff(time, time, date_time_part string) returns bigint
where date_time_part in (microsecond, millisecond, second, minute, hour)
function time_sub(time, interval microsecond to hour) returns time
function time_trunc(time, time_part string) returns time
where time_part in (microsecond, millisecond, second, minute, hour)
