2018 has been a sweltering summer in Tokyo. With temperatures surpassing 40 degrees Centigrade (104 degrees Fahrenheit) in early August, the media and internet had a field day on perceived disastrous consequences of athletes and spectators collapsing on the streets and in the stands during the 2020 Tokyo Olympics.

But when the idea of incorporating Daylights Saving Time in Japan came up, the media and internet in Japan had another field day condemning that idea.

Why is daylights saving time – the idea of pushing the clock ahead in the summer of 2020 – being considered? There are two reasons brought up.

• Potentially cooler weather for the marathon runners: An early start time of 7:30 am is being considered for the marathons. If the clocks are pushed one hour ahead, 7:30 am is actually 6:30 am – the presumption being that the conditions will be cooler.
• Broadcaster’s bottom line: Additional advertising revenue for the American broadcaster could be gained by shifting the clock at least one hour ahead. If we presume that 10 am will be a starting time for a lot of major events, that would be 9 pm in New York City without daylight saving, and 8pm with daylight saving.

The South Korean government agreed to institute daylight saving time in 1988, the year of the Seoul Olympics. According to this article, a Trans World International executive named Barry Frank was hired as a consultant to the Seoul Olympic Organizing Committee (SLOOC), and helped the committee negotiate with the networks for broadcasting rights.

Frank seemingly had an insoluble problem — an Olympics half a world away, with individual athletic federations balking at changing their starting times and U.S. television balking at paying hefty rights for delayed telecasts. Any hour he could find to add to our prime-time schedule was crucial. NBC is paying a base of $300 million for U.S. television rights, with a risk-sharing formula tied to advertising sales that could boost the fee to $500 million. “This might have been worth $25 million in the overall scheme of things,” Frank said of the daylight savings ploy.

So the clocks in South Korea shifted one hour ahead in the summer of 1988. That was the only year Korea had daylight saving time.

The Japanese government may be considering it, but there may be some lingering bad memories of a time when Japan did have daylight saving. That was in the immediate years after World War II. Japan had lost the war, and was placed under the control of the Allied Powers, led by the Supreme Commander of the Allied Powers, American General Douglas MacArthur. The Americans, thinking of the positive impact that DST has had in the US, thought the Japanese would welcome an extra hour of daylight in the summer evenings. They didn’t.

According to historian John Dower, in his book, Embracing Defeat: Japan in the Wake of World War II, the immediate post-war years were miserable ones of loss, destitution and despair. Bringing on the night, and retreating to the shadows as soon as possible, was preferable apparently.

It was also in 1948 that lingering exhaustion in the general population translated into widespread popular criticism of one of the occupation’s most minor innovations, the introduction of American-style daylight savings time. Called sanmo taimu (“summer time”) in the marvelous new pidgin terminology of the moment, setting the clock forward an hour was opposed on the grounds that it simply extended the difficulty of “daily” life. People preferred that darkness come earlier, although they did not succeed in getting daylight savings time repealed until September 1951.

When it became known this year that daylight saving time was being considered by the government to deal with the summer heat issues during the upcoming Olympics, the reaction was generally negative. The recommendation being discussed was a two-hour shift ahead, and the fears of even longer working hours filled the air, according to Reuters.

Economists said the measure’s impact on behavior could be mixed. “If people start working two hours early and finish two hours early, consumer spending is expected to rise,” said Toshihiro Nagahama, executive chief economist at Dai-ichi Life Research Institute. “But given the labor shortage, the end of working time may not change and people may still work longer hours.”

That was the biggest fear on social media, where the topic was one of Monday’s hottest and worries ranged from having to reprogram computers to losing sleep. “It’s way too easy to imagine that we’ll start work two hours earlier and finish the same in the dark, meaning long days,” wrote one.