Rails | at_beginning_of_month 日付操作 月初, 翌月の月初、先月の月初の取得

月初を取得

# 月初を取得
Date.today.at_beginning_of_month
# => Wed, 01 Dec 2010

翌月の月初を取得

# 翌月の月初を取得
Date.today.at_beginning_of_month.next_month
# => Sat, 01 Jan 2011

翌々月の月初を取得

Date.today.at_beginning_of_month.next_month.next_month
# => Tue, 01 Feb 2011

先月の月初を取得

# 先月の月初を取得
Date.today.at_beginning_of_month.prev_month
# => Mon, 01 Mar 2021

4/1 - 4/15と、先月の同期間(3/1 - 3/15)の比較

@last_month_conversions = Conversion.where(conversion_date: Date.today.Date.today.at_beginning_of_month.prev_month..Date.today.prev_month
)
@this_month_conversions = Conversion.where(conversion_date: Date.today.Date.today.at_beginning_of_month..Date.today)