WolframAlpha is my go-to for one-off calculations involving either durations and units. For your example, the WolframAlpha query "time in London at 1:39 pm MST

WolframAlpha is my go-to for one-off calculations involving either durations and units. For your example, the WolframAlpha query "time in London at 1:39 pm MST on October 13" returns the correct answer, "9:39:00 pm BST | Sunday, October 13, 2024"[1]. While WolframAlpha's natural language processing is hit-or-miss, its responses clearly state assumptions made in the face of ambiguity. In this example: Assuming "MST" is a named time zone Assuming "time" is referring to a calendar computation Assuming month/day Assuming Mountain Time (United States; no observed DST rule) Assuming London (United Kingdom) [1] https://www.wolframalpha.com/input?i=time+in+London+at+1%3A39+pm+MST+on+October+13 https://www.wolframalpha.com/input?i=time+in+London+at+1%3A3...