According to documentation, the maintenance.create method should uphold these parameters as default when creating a new maintenance:
active_since timestamp Time when the maintenance becomes active. Default: current time.
active_till timestamp Time when the maintenance stops being active.
Default: the next day.
However, when trying to create a new maintenance via the API without specifying active_since and active_till, the API fails with one of the following errors:
"Active since" must be between 1970.01.01 and 2038.01.18.
"Active till" must be between 1970.01.01 and 2038.01.18.