'''clock milliseconds''', which replaces [[[clock clicks] -milliseconds]] in Tcl 8.5beta, returns the current time as an integer number of milliseconds since the epoch.

**Leap seconds**

[AMG]: Tcl time provides the illusion that all days are 86400 seconds in length, even though occasionally a leap second is added to synchronize UTC with TAI (atomic time).  After a leap second occurs, Tcl seconds are made slightly slower.

It appears [[clock milliseconds]] and [clock microseconds] are also slowed correspondingly so as to remain in sync with [[clock seconds]].  If they weren't, as of mid-2019 there would be a 37-second difference between [[clock seconds]] and [[clock milliseconds/microseconds]].

**See also**

   * [clock seconds]
   * [clock microseconds]
   * [clock clicks]

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