When Beta2 is released sometime later this year.
Meanwhile, have you tried the temporary fix previously
posted by Mikolaj?
Quote.
please do the following:
1. Close MSAS
2. In control panel "Regional and Language Options",
button "Customize", tab
"Time", configure a 12-hour AM/PM time format.
3. Open MSAS, configure your desired schedule in 12-hour
AM/PM format, click
"Save", close MSAS.
4. In control panel "Regional and Language Options",
button "Customize", tab
"Time", re-configure your preferred 24-hour time format.
Unquote.
Stu