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+`PEXPIRETIME` has the same semantic as `EXPIRETIME`, but returns the absolute
+Unix expiration timestamp in milliseconds instead of seconds.
+
+@return
+
+@integer-reply: Expiration Unix timestamp in milliseconds, or a negative value
+in order to signal an error (see the description below).
+
+- The command returns `-1` if the key exists but has no associated expiration
+  time.
+- The command returns `-2` if the key does not exist.
+
+@examples
+
+```cli
+SET mykey "Hello"
+PEXPIREAT mykey 33177117420000
+PEXPIRETIME mykey
+```