Find All Rows For A Certain Day; Count Days Between Two Dates

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# Find all rows created on a certain day; Rails apparently has a built-in :db string format
self.find(:all, :conditions => ["created_at >= ? AND created_at <= ?", day.beginning_of_day.to_s(:db), day.end_of_day.to_s(:db)])

# Find number of days between two dates
def days_between_dates(first, last)
  (YMD(last) - YMD(first))
end

def YMD(date)
  date.to_date.to_s.gsub("-", "").to_i
end

Tags:
• ActiveRecord
• date
• MySQL
• Rails
• time

Comments

Snippets Manager replied on Tue, 2009/08/04 - 4:35pm

my code contained a little bug as well (linked to daylight saving) this would work better: # Find number of days between two dates def days_between_dates(first, last) ((last.to_time(:utc) - first.to_time(:utc)) / (24*60*60)).to_i end

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Snippets Manager replied on Tue, 2009/08/04 - 4:35pm

the code days_between_dates provided is buggy (it won't work if the dates are in different months). A possible & simpler alternative: # Find number of days between two dates def days_between_dates(first, last) ((last.to_time - first.to_time) / (24*60*60)).to_i end

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