timeInterval 指的是两个时间间隔的秒数
比如
let now = Date().timeIntervalSince1970 // 从1970距今的秒数
这个返回的即时unix时间戳
自定义时间
// 一天是86400秒
let yestoday = Date(timeIntervalSinceNow:-86400).timeIntervalSince1970
时间比较
func compareDate(_ dateA: Date, withAnotherDate dateB: Date) {
let result = dateA.compare(dateB)
if result == ComparisonResult.orderedAscending {
print("now compared with feture")
} else if result == ComparisonResult.orderedDescending {
print("now compared with past")
} else {
print("I think you compared with yourself")
}
}
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