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+= Single Letter Expansions
+
+The following are single letter expansions.  These expansions do not
+use the typical `%{...}` format.  Instead, they are short-cuts for
+simple, common cases.
+
+== Miscellaneous
+
+`%%`::
+
+Returns `%`.
+
+
+== Current Time
+
+`%c`::
+
+The current Unix epoch time in seconds. This is an unsigned decimal number.
+It should be used with time-based calculations.
+
+`%C`::
+
+The microsecond component of the current epoch time. This is an unsigned
+decimal number. It should be used with time-based calculations.
+
+
+== Request Time
+
+`%l`::
+
+The Unix timestamp of when the request was received. This is an unsigned
+decimal number. It should be used with time-based calculations.
+
+`%Y`::
+
+Four-digit year when the request was received.
+
+`%m`::
+
+Numeric month when the request was received.
+
+`%d`::
+
+Numeric day of the month when the request was received.
+
+`%H`::
+
+Hour of the day when the request was received.
+
+`%G`::
+
+Minute component of the time when the request was received.
+
+`%e`::
+
+Second component of the time when the request was received.
+
+`%M`::
+
+Microsecond component of the time when the request was received.
+
+`%D`::
+
+Request date in the format `YYYYMMDD`.
+
+`%S`::
+
+Request timestamp in SQL format, `YYYY-mmm-ddd HH:MM:SS`.
+
+`%t`::
+
+Request timestamp in _ctime_ format, `Www Mmm dd HH:MM:SS YYYY`.
+
+`%T`::
+
+Request timestamp in ISO format, `YYYY-mm-ddTHH:MM:SS.000`.
+
+
+// Copyright (C) 2020 Network RADIUS SAS.  Licenced under CC-by-NC 4.0.
+// Development of this documentation was sponsored by Network RADIUS SAS.