Fix histogram current event and time stamp format parsing

Fix histogram current event and time stamp format parsing

The parsing of date format is updated to use the time stamp format's
time zone.

DAY_OF_YEAR field is not copied from the reference time as setting it
also updates the MONTH and DATE, causing premature break out of the
field-copying loop.

HOUR_OF_DAY field is used to copy from the reference time instead of
the HOUR field, as the latter only uses a 12-hour clock.

The current event text control now uses the current event time value as
a reference time for parsing, instead of the trace start time. This
allows a time stamp format preference, which contains insufficient date
and time fields to fully represent the whole trace range, to be usable
in the text control. The non-visible date and time fields are assumed to
be set equal to those of the current event.

Change-Id: I25c67787c20aa26a0f267f8d460b441b74185122
Reviewed-on: https://git.eclipse.org/r/9051
Tested-by: Hudson CI
Reviewed-by: Bernd Hufmann <bhufmann@gmail.com>
IP-Clean: Bernd Hufmann <bhufmann@gmail.com>
Tested-by: Bernd Hufmann <bhufmann@gmail.com>