SwiftDateExtension是Swift日期扩展。
简单示例：
//-- Adding time units:let date1: NSDate = NSDate().plusMonths(2).minusDays(5).plusSeconds(5)let date2: NSDate = NSDate().plusYears(1).minusMonths(6)//-- Calculating difference between dates:let weeksBetween = NSDate.monthsBetween(date1: someDate, date2: someOtherDate)let monthsBetween = NSDate.weeksBetween(date1: someDate, date2: someOtherDate)
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