Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates. Get the current Unix time or convert any date to a timestamp.

This calculator runs one of three separate code paths depending on Mode, and each path reads a different subset of the seven inputs. In Timestamp to Date mode (the default), only the Unix Timestamp field is read at all -- Year, Month, Day, Hour, and Minute are completely ignored, so changing any of them has zero effect on the result while Mode stays on this setting (lines 30-51). In Date to Timestamp mode, the calculator flips the other way: it builds the result entirely from Year, Month, Day, Hour, and Minute using UTC time explicitly (line 54), and the Unix Timestamp field you typed is ignored instead. Current Time mode reads none of the date fields; it just takes the machine's clock at the moment you run it (lines 23-29). Relative Time is built from its own set of hand-picked thresholds -- under a minute reports seconds, under an hour reports minutes, under a day reports hours, under 30 days reports days, under 365 days reports months, and beyond that reports years (lines 38-43) -- and that bucketing logic only runs in full in Timestamp to Date mode; Date to Timestamp mode uses a simpler version that only distinguishes "just now" from a plain day count (lines 58-61), so the same underlying time gap can be described with different granularity depending on which mode produced it. Timestamp (ms) is always the seconds-based Unix Timestamp multiplied by 1,000 (line 64), never computed independently. The calculator does not validate that Year, Month, Day, Hour, and Minute form a real calendar date before handing them to JavaScript's date construction -- an out-of-range value like a 31st day in a 30-day month rolls forward into the next month rather than being rejected.