startOf('day') gets previous day using ember-moment service

version:
ember-moment: 7.4.1

Issue in getting start of date using ember moment service.
get(this, 'moment').moment().startOf('day').toDate() -> gets previous date.
moment().startOf('day').toDate() -> gets correct date.

May I know why this occurs?

Reproduce the report in ember-moment 7.4.1 by comparing get(this, 'moment').moment().startOf('day').toDate() with moment().startOf('day').toDate(). Start by finding where the ember-moment service creates or configures its moment instance. Done means the service call no longer returns the previous date, or the difference is explained in project documentation/tests.

索引モデルが issue の本文から書いたものです。