second package:text-icu

Field indicating the second within the minute. E.g., at 10:04:15.250 PM the UCAL_SECOND is 15.

Field indicating the millisecond within the second. E.g., at 10:04:15.250 PM the UCAL_MILLISECOND is 250.

Ranges from 0 to 23:59:59.999 (regardless of DST). This field behaves exactly like a composite of all time-related fields, not including the zone fields. As such, it also reflects discontinuities of those fields on DST transition days. On a day of DST onset, it will jump forward. On a day of DST cessation, it will jump backward. This reflects the fact that it must be combined with the DST_OFFSET field to obtain a unique local time value.