codeclimate/codeclimate-rubocop

This cop checks for the correct use of Date methods,
such as Date.today, Date.current etc.

Using Date.today is dangerous, because it doesn't know anything about
Rails time zone. You must use Time.zone.today instead.

The cop also reports warnings when you are using 'to_time' method,
because it doesn't know about Rails time zone either.

Two styles are supported for this cop. When EnforcedStyle is 'strict'
then the Date methods (today, current, yesterday, tomorrow)
are prohibited and the usage of both 'to_time'
and 'to_time_in_current_zone' is reported as warning.

When EnforcedStyle is 'flexible' then only 'Date.today' is prohibited
and only 'to_time' is reported as warning.

### Example: EnforcedStyle: strict
    # bad
    Date.current
    Date.yesterday
    Date.today
    date.to_time
    date.to_time_in_current_zone

    # good
    Time.zone.today
    Time.zone.today - 1.day

### Example: EnforcedStyle: flexible (default)
    # bad
    Date.today
    date.to_time

    # good
    Time.zone.today
    Time.zone.today - 1.day
    Date.current
    Date.yesterday
    date.to_time_in_current_zone