Chapter 4 – Concepts of Temporality

1. A is correct. UTC is used for the normalization reference.
2. C is correct. The client time uses the UTC reference extended by the time zone shift definition, whereas local time applies the time zone directly to the value itself.
3. C is correct. The Gregorian calendar correctly applies the current rules for the leap year definition.
4. If he was 17 the day before yesterday, he must have had his 18th birthday yesterday.
5. In order for him to be 20 next year, he must be 19 this year. So, today must be the beginning of the year – January 1.
6. The timeline is shown in Figure A.1:

Figure A.1 – Solution: time positions