Steps to reproduce:

1. Try to set maintenance windows by api for the future with this request

2. {"jsonrpc": "2.0", "method": "maintenance.create", "params": \{"name": "Maintenance period for: itet test script", "active_since": 1714554900, "active_till": 1714562100, "groups": [{"groupid": 51}], "description": "This maintenance period is created by a script.", "timeperiods": [\{"period": 3600, "timeperiod_type": 0, "start_time": 33300, "startdate": 1714555000}], "tags": {}}, "auth": "api-token", "id": 1}
   

Result:
no maintenance windows for the 1. May set
Expected:
Set maintenance windows for the 1. May from 09:15 until 11:15