2.11.3.3 Current time and clock resolution

The following procedures are required.

Function: current-date

Function: current-date tz-offset

Return a date corresponding to the current UTC time.

tz-offset must be an exact integer representing the time zone offset in number of seconds; when not given it defaults to the local time zone.

Function: current-julian-day

Current Julian Day.

Function: current-modified-julian-day

Current Modified Julian Day.

Function: current-time

Function: current-time time-type

Current time, of type time-type system, which defaults to time-utc.

Function: time-resolution

Function: time-resolution time-type

Return an exact integer representing the clock resolution, in nanoseconds, of the system clock of type type time-type system, which defaults to time-utc.