Epoch Time Converter

Convert between Unix epoch timestamps (seconds or milliseconds) and human-readable date strings in any IANA timezone. Use when the user provides a number that looks like a Unix timestamp (10 digits ≈ seconds, 13 digits ≈ milliseconds) and asks what time it is, or provides a date/time string and wants the corresponding epoch value. Triggers on phrases like "what time is 1700000000", "convert epoch", "unix timestamp to date", "to UTC", "to Asia/Shanghai", "epoch in milliseconds".

by @terrycarter1985·MIT-0