Unix epoch
What this is
Unix time counts seconds (ignoring leap seconds on most systems) since 1970-01-01T00:00:00Z. Timestamp 0 is that instant. Negative values are earlier. Excel, NTP, and Apple Cocoa use different epochs — do not mix them.
01970-01-01T00:00:00.000Z
Zones: UTC · New York · Los Angeles · Chicago · London · Paris · Berlin · India (Kolkata) · Tokyo · Singapore · Dubai · Sydney
FAQ
- Is 0 invalid?
- No. It is a real instant. APIs that treat 0 as 'missing' will corrupt historical data.