我有一个日期保存在Firestore字段中作为时间戳,我想将其转换为Swift中的日期:
June 19,2018 at 7:20:21 PM UTC-4
我尝试了以下操作,但出现错误:
let date = Date(timeIntervalSince1970: postTimestamp as! TimeInterval)
错误:
Could not cast value of type 'FIRTimestamp' (0x104fa8b98) to 'NSNumber'
我想转换为Date的原因是为了可以使用此Date扩展名模仿您在Instagram帖子上看到的时间戳:
extension Date { func timeAgoDisplay() -> String { let secondsAgo = Int(Date().timeIntervalSince(self)) let minute = 60 let hour = 60 * minute let day = 24 * hour let week = 7 * day if secondsAgo < minute { return "\(secondsAgo) seconds ago" } else if secondsAgo < hour { return "\(secondsAgo / minute) minutes ago" } else if secondsAgo < day { return "\(secondsAgo / hour) hours ago" } else if secondsAgo < week { return "\(secondsAgo / day) days ago" } return "\(secondsAgo / week) weeks ago" } }
可以这样做:
let date = postTimestamp.dateValue()
或者你可以这样做:
let date = Date(timeIntervalSince1970: postTimestamp.seconds)
请参阅时间戳参考文档。