I think I discovered in the World Radio and Television Handbook that countries throughout the world use DST, not just Europe and North America.
To answer an earlier post, stations on Clear Channels in 1974 that had no PSRA were authorized 50 watts for one hour before local sunrise as determined by FCC rules.
Many Class III-S stations, which are now Class Ds on Regional Channels, were authorized 500 watts, often nondirectional, at 6:00 AM local time. And sunset was an hour later local time. So stations that were usually on the air about 11 hours a day (6:00 AM to 5:00 PM), were on 12 hours a day (6:00 AM to 6:00 PM) due to winter DST, with substantial power. The Class III-Ss were of course enthusiastic for that reason. The daytimers also pushed for DST in states where it was not observed, so they could extend their broadcast day by one hour.
To answer an earlier post, stations on Clear Channels in 1974 that had no PSRA were authorized 50 watts for one hour before local sunrise as determined by FCC rules.
Many Class III-S stations, which are now Class Ds on Regional Channels, were authorized 500 watts, often nondirectional, at 6:00 AM local time. And sunset was an hour later local time. So stations that were usually on the air about 11 hours a day (6:00 AM to 5:00 PM), were on 12 hours a day (6:00 AM to 6:00 PM) due to winter DST, with substantial power. The Class III-Ss were of course enthusiastic for that reason. The daytimers also pushed for DST in states where it was not observed, so they could extend their broadcast day by one hour.