Final answer:
School zone signs indicate the times when reduced speed limits are in effect, which typically correspond to specific hours on school days as posted by local regulations. Daylight saving time extends evening daylight and is separate from school zone regulations. The International Date Line is unrelated to school zone timings.
Step-by-step explanation:
The question relates to the typical timings during which a school zone speed limit is in force. This can vary by jurisdiction, but commonly, the provincial time for school zone speed limits is during set hours on school days, typically when children are likely to be arriving at or leaving school. These hours are not necessarily during daylight hours only, nor are they in the evening, nor are they all the time. Clear signage is usually posted in school zones to indicate the specific times when reduced speed limits are in effect. It is important to always observe local traffic signs and regulations.
Regarding the additional information provided on daylight saving time, it is a system where clocks are set forward by one hour to extend evening daylight during warmer months. The approach's efficacy is a matter for political discussion in various regions. The International Date Line is not directly relevant to the question of school zone signs, but it is an important concept in understanding global time zones and the changes that occur when traveling across this line.