When

• I call "get history cleanup configuration" REST endpoint

Then

• I get historyCleanupBatchWindowStartTime and historyCleanupBatchWindowEndTime as datetime with timezone values, which represent current or next batch window

Example:
batch window is configured to 23:00 - 01:00
now 07.09.2017 16:00 -> return 07.09.2017 23:00:00+0200 - 08.09.2017 01:00:00+0200
now 07.09.2017 23:15 -> return 07.09.2017 23:00:00+0200 - 08.09.2017 01:00:00+0200
now 08.09.2017 00:05 -> return 08.09.2017 23:00:00+0200 - 09.09.2017 01:00:00+0200
now 08.09.2017 02:00 -> return 08.09.2017 23:00:00+0200 - 09.09.2017 01:00:00+0200

Hints:

• we should create some HistoryCleanupConfigurationDto, as may be in the future more data about history cleanup configuration will be needed in REST API
• there are some related methods in HistoryCleanupHelper class, probably we can extend it with new methods