There is at least one earlier thread but I'm sure there is also another, because I recall posting to it, but can't now find it easily.
I may have had earlier ones but they coincide with experiences I had over the first few years of my life; this is the earliest I can date relatively securely.
I was on my grandparents' dairy farm at Arawata, in South Gippsland (Oz), with a family group out rabbiting one afternoon. While we were standing on a bit of a hill, someone asked what the time was; the reply was "Nine o'clock." I can distinctly recall that the sun was about a handspan (5-10 degrees) above the horizon, at that time.
Later, when I had had some schooling, this memory bothered me, because I knew that the sun at our latitude never (but never!) set any later than 7.30pm, and I wondered how in blazes this memory had come about.
In 1964 I was doing plant ecology and we were all out on an excursion to the mangrove swamps at the top end of Westernport Bay and the topic of daylight saving came into the discussion; its introduction to Victoria was being considered at that time, and it had already been introduced in Tassie. Our lecturer commented "During the war (WWII), we had two hour daylight saving." Instantly, (in less than the time taken to read this paragraph), the memory from the farm went through my head with this as an explanation.
I would have just turned 3, at the very oldest, but could have been younger, although I might not have been out rabbiting at younger than 2.
No trauma was associated, but I obviously had "language" (which I think is an important, if not essential, component of memory) and have often wondered what it was that drove the scene and words into my memory, as I was then far too young to realise the significance of astronomical timing and geometry.