From language/terms

See Original text in context

Returns an Instant object representing the current time. It includes leap seconds and as such a few dozen seconds larger than time:

say (now - time).Int; # OUTPUT: «37␤»

From type/DateTime

See Original text in context

method now(:$timezone = $*TZ, :&formatter --> DateTime:D)

Creates a new DateTime object from the current system time. A custom formatter and timezone can be provided. The :$timezone is the offset in seconds from GMT and defaults to the value of $*TZ variable.

say DateTime.now; # OUTPUT: «2018-01-08T13:05:32.703292-06:00␤»

Note that one may use the methods shown below chained to the .now to easily express current values, e.g.,

say DateTime.now.year; # OUTPUT: «2018␤»