Time formatting list view

Hi!
I'm working now for days on one problem: I'm working with the costum layouts, to get a special format in the list view.
If it is an allday event, only the date should be shown, but no time. If there is a starttime but no endtime, the layout should be for example: 08:00. If there is a starttime and an endtime the layout should be for example: 08:00 - 12:00.

I've tried it with some codes, but it never worked well.
First of all, I tried that one:

{{Title Link:TITLE_LINK}}

{{Startdatum:STARTDATE; %A, %d. %B %Y}}{{Enddatum des mehrtägigen Events:MULTIENDDATE; - %A, %d. %B %Y}}

{{Startzeit:STARTTIME}} - {{Endzeit:ENDTIME}}

This is good, if there is start- and endtime. But if i have an event with only a starttime, I get: "08:00 - ". If I have an allday event, I get: " - ".

Then I tried this code:

{{Title Link:TITLE_LINK}}

{{Startdatum:STARTDATE; %A, %d. %B %Y}}{{Enddatum des mehrtägigen Events:MULTIENDDATE; - %A, %d. %B %Y}}

{{Startzeit:STARTTIME;%H:%M}}{{Endzeit:ENDTIME; - %H:%M}}

Now, if any time is not defined, I get 00:00 or 23:59. For example at an allday event I get the time: 00:00 - 23:59.

I hope you can help me to get the right format.
Thank you everybody for helping and supporting.

Walter

P.S. here is my support information.

PHP Version : 5.6.10

MySQL Version : 5.5.43

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Load JEvents Bootstrap JS? : Yes

Max Input Vars ? : 1000

Club code set? : No  

Joomla : 3.4.3

component_com_jevents : 3.2.19

module_mod_jevents_cal : 3.2.19

module_mod_jevents_custom : 3.2.19

module_mod_jevents_filter : 3.2.19

module_mod_jevents_latest : 3.2.19

module_mod_jevents_legend : 3.2.19

module_mod_jevents_switchview : 3.2.19

plugin_content_jevents : 3.2.19

plugin_finder_jevents : 3.2.19 (not enabled)

plugin_search_eventsearch : 3.2.19