WhenAvailable might be a bit more popular than Spacetime. We know about 1 link to it since March 2021 and only 1 link to Spacetime. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
How about spacetime.am? A website or tool for time differences and to manage stuff and be able to check stuff. Previously, I tried to make it easier to manage our time zones thingy but then I thought maybe it isn't good. So I looked up and found it. Here's the screenshot link and you can search it up yourself and maybe someone, probably the creator of this maybe. Bye bye for now. Source: about 3 years ago
No pdfs involved but this site might be useful to you. They have a free and paid tier. When Available. Source: over 2 years ago
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