An absolute time. No literal syntax is provided for the TIME type; instead, see the std.time function for creating a TIME value:

This is a companion discussion topic for the original entry at https://developer.fastly.com/reference/vcl/types/time

The first example has a typo in the variable name, should be:

declare local var.t TIME;
set var.t = std.time("Fri, 21 Aug 1981 14:51:07 GMT", now);