+ date+ dateWithTimeIntervalSinceNow:+ dateWithTimeInterval:sinceDate:+ dateWithTimeIntervalSinceReferenceDate:+ dateWithTimeIntervalSince1970:– init– initWithTimeIntervalSinceNow:– initWithTimeInterval:sinceDate:– initWithTimeIntervalSinceReferenceDate:– initWithTimeIntervalSince1970:– timeIntervalSinceDate:– timeIntervalSinceNow+ timeIntervalSinceReferenceDate– timeIntervalSinceReferenceDate– timeIntervalSince1970– dateByAddingTimeInterval:– addTimeInterval: Deprecated
in iOS 4.0
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iOS 基础类解析 - NSDate,布布扣,bubuko.com
原文：http://blog.csdn.net/opengl_es/article/details/24863095