Numbers after decimal place in timeIntervalSince1970

let time = Date().timeIntervalSince1970

returns

1484904148.363985


1484904148 is the epoch time in seconds,


What is 363985 ? Must be millseconds in there somewhere....

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timeIntervalSince1970
is a floating point count of the number of seconds since the UNIX epoch. The numbers after the decimal point aren’t milliseconds per se, but fractions of a second. You can get milliseconds by rounding the value to three decimal places, microseconds by rounding to 6, and so on.

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