- Search of a Shortest Path in a Graph of Spots
- Preparation to the Manipulation of a Gregorian Calendar
- Determination of the Kind of Year of a Calendar
- Determination of the Absolute Day Number of a Calendar
- Determination of the Absolute Second Number of a Calendar
- Determination of the Calendar and the Weekday of a Couple (day ; second)
- Addition of n Hours to a Calendar
- Subtraction of n Hours from a Calendar