Added comments to show special date options.

plugins/Timestamps.xml

@@ -20,6 +20,44 @@ TIMESTAMP_INPUT_BACK_COLOUR
 TIMESTAMP_OUTPUT_BACK_COLOUR
 TIMESTAMP_NOTES_BACK_COLOUR
 
+Special characters for date/time etc.
+-------------------------------------
+
+General
+-------
+
+%E - MUSHclient initial (startup) directory
+%F - world files directory
+%L - log files directory
+%N - world name
+%P - player name
+
+Date/time
+---------
+
+%a - Abbreviated weekday name
+%A - Full weekday name
+%b - Abbreviated month name
+%B - Full month name
+%c - Date and time representation appropriate for locale
+%d - Day of month as decimal number (01 - 31)
+%H - Hour in 24-hour format (00 - 23)
+
+%I - Hour in 12-hour format (01 - 12)
+%j - Day of year as decimal number (001 - 366)
+%m - Month as decimal number (01 - 12)
+%M - Minute as decimal number (00 - 59)
+%p - A.M./P.M. indicator for 12-hour clock
+%S - Second as decimal number (00 - 59)
+%U - Week of year as decimal number, with Sunday as first day of week (00 - 53)
+%w - Weekday as decimal number (0 - 6; Sunday is 0)
+%W - Week of year as decimal number, with Monday as first day of week (00 - 53)
+%x - Date representation for current locale
+%X - Time representation for current locale
+%y - Year without century, as decimal number (00 - 99)
+%Y - Year with century, as decimal number
+%z, %Z  - Time-zone name or abbreviation; no characters if time zone is unknown
+%% - Percent sign
 
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