Expressif is the variable substitution syntax combined with a library of predicates and functions. Initially designed for NBi.io, Expressif allows you to define variables, transformations of these variables (with expressions and functions), in plain text, which can then be interpreted by the engine. Same can be done with predicates.
set-to-utc: force the current time zone to UTCset-to-local(timeZone): force the current time zone to the timezone given in argument