With a POD in the 1930s, your challenge is to advance tech so much that the 1980s have 2030s-level technology.
A cunning change in the way calendars are managed.
Well, one possibility might be if Bell Laboratories' discoveries of how the Cat's Whisker crystal detector worked - in OTL this happened around 1940, which led to the eventual development of the Transistor by 1947 - occurred decades earlier. The cat's whisker was patented in 1906, and from what I've read of the experiments conducted there was nothing that was done - other than motivation (they were working on RADAR in the lead up to WW2) - that could not have happened as early as the 1910s.
So, let's say the discovery of how the Cat's Whisker worked occurs in 1910 instead of 1940, with something like the transistor invented by 1917 instead of 1947. Obviously there'd be a lot of butterflies from that, but inventing the transistor 30 years earlier in the wake of WW1 rather than WW2 might potentially lead to the development of digital electronic computers sooner. In which case, who knows how far technology might advance in the lead up to and during World War II?
This would work, yes.
And I'm also going to go against conventional wisdom here and say that without the World Wars, the world would be more advanced. A greater number of scientists and potential scientists would be alive, the economic panorama would look a lot better, allowing people to dedicate themselves to the sciences without being forced into the war effort, and international cooperation and communications would lead to a better spread of scientific discoveries.
Well, one possibility might be if Bell Laboratories' discoveries of how the Cat's Whisker crystal detector worked - in OTL this happened around 1940, which led to the eventual development of the Transistor by 1947 - occurred decades earlier. The cat's whisker was patented in 1906, and from what I've read of the experiments conducted there was nothing that was done - other than motivation (they were working on RADAR in the lead up to WW2) - that could not have happened as early as the 1910s.
So, let's say the discovery of how the Cat's Whisker worked occurs in 1910 instead of 1940, with something like the transistor invented by 1917 instead of 1947. Obviously there'd be a lot of butterflies from that, but inventing the transistor 30 years earlier in the wake of WW1 rather than WW2 might potentially lead to the development of digital electronic computers sooner. In which case, who knows how far technology might advance in the lead up to and during World War II?