%t[argument] special text
%t[12|24] references the actual system time, e.g.:
The text `Time: %t --> Dentist at 10:00' will be expanded to
==> `Time: 07:32 --> Dentist at 10:00', in case the actual system time value is 07:32 o'clock (hh:mm).
If only %t is specified, the system time value will implicitly
be displayed using the 24-hour format (==%t24). For
displaying using the 12-hour format, add 12 directly behind
%t, e.g. `%t12'.
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