What time did the air attack on Pearl Harbor occur

What time did the air attack on Pearl Harbor occur

Hi all, it’s a simple question, and a simple answer, Sunday 7th December at 07.48. But when you ask what time that was in say, London, oh my it gets interesting, and then ask what the time was in Australia, Hong Kong or Singapore, and you have a head ache. This is all due to the use of Daylight Saving Time (DST) which was in use in various parts of the globe at the time, and pre dated the use of the Universal Time Clock (UTC)

The little I can understand is
London was using a version of DST that was two hours ahead of GMT

Singapore was plus 7.30 hours on GMT which I think was British winter time

Hong Kong was plus 8.30 hours on GMT

Australia had/has three time zones, but I’m unsure of them

Does anyone know of a website where this is all worked out, or are sure they know the answer?

Regards
Fatboy Coxy

 

Britain wasn't using DST at the time but DDST which was Double Daylight Saving Time

 

Thanks ARWR

 

Britain adopted Double Daylight Saving (DDS) in 1939 which was all year round setting the clocks two hours forward but introduced a Winter Daylight Saving (WDS) which set the clocks back an hour in Autumn. The USSR had introduced DST by a decree of Stalin's in 1930 but he never decreed a setting back of the clocks for winter so that effectively DST lasted until after his death. France and Spain adopted DST but only for Paris and Madrid and most companies compensated by moving lunch time and siesta a clock hour back

 

Thanks ARWR, although I still don't quite understand how militarily that was a help for Britain

 

It was meant to have an industrial benefit by moving some production to when electricity for lighting would not be needed. However given that the demand for simple blackout measures led to most factories simply painting all their glass roofing/windows etc black whilst war production pushed them to 3 shift working so they needed 24/7 artificial lighting it generally failed to achieve such gains,

It would generate non coastal USA and Canada where there was no need for a blackout the most benefit

 

According to this site, DST was throughout the war, DDST was only from late-February, early-April, or early-May depending on the year, and always ended in early-August.
Daylight Saving Time Changes 1941 in London, England, United Kingdom

 

It's not even internally consistent.
10 Aug 1941 - Daylight Saving Time Decreased
Double DST ended – Clocks were turned back from double DST (2 hours ahead of standard time) to DST (1 hour ahead of standard time).
When local daylight time was about to reach

 

What is inconsistent?

They are continually on daylight savings time, except when they go to double daylight savings time. Hence, daylight savings time is increased when going to double and decreased when coming off double...but daylight savings time does not end.

So where is the inconsistency?