# Index of module types

C
Comparable [Utils] | Interface for comparable and hashable types.
S
S [Printer] | Generic signature of a printer-parser.
S [Calendar_sig] | Common operations for all calendar representations.
S [Date_sig] | Common operations for all date representations.
S [Time_sig] | Common operations for all time representations.
S [Period] | Common interface for all periods.
Second [Time_sig] | Interface for seconds.