strtotime('-1 month') returning wrong date if month have 31 days

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jQuery datepicker will not allow selecting dates when month has 31 days and select 1st day of month

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Why is February, month 2, showing it has 31 days in javascript?

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(Time.now.utc.to_date + 1.month + 15.days) != (Time.now.utc.to_date + 15.days + 1.month)

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(Time.now.utc.to_date + 1.month + 15.days) != (Time.now.utc.to_date + 15.days + 1.month)

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