如何将数据库中的值与当前日期进行比较?执行某些操作时,日期会保存在数据库中,我需要将该日期与当前日期进行比较并执行一些操作。我怎样才能做到这一点 ?
日期以这种格式保存在我的日期库中:
var tasksin2 : Task?
dateFormatter.dateFormat = "dd/MM/yyyy hh:mm"
let mydate="\(dateFormatter.string(from: datePicker.date))"
tasksin2?.time=mydate
(UIApplication.shared.delegate as! AppDelegate).saveContext()
最佳答案
给你:
extension String {
func toDate() -> Date? {
let formatter = DateFormatter()
formatter.dateFormat = "dd/MM/yyyy hh:mm"
return formatter.date(from: self)
}
}
class MyViewController: UIViewController {
var dateString1: String!
var dateString2: String!
override func viewDidLoad() {
super.viewDidLoad()
// set dateStrings
printDateTypes()
}
func printDateTypes() {
guard let date1 = dateString1.toDate() else {
print("dateString1: \(dateString1) | Failed to cast to \"dd/MM/yyyy hh:mm\"")
return
}
guard let date2 = dateString2.toDate() else {
print("dateString2: \(dateString2) | Failed to cast to \"dd/MM/yyyy hh:mm\"")
return
}
let isDescending = date1.compare(date2) == ComparisonResult.orderedDescending
print("orderedDescending: \(isDescending)")
let isAscending = date1.compare(date2) == ComparisonResult.orderedAscending
print("orderedAscending: \(isAscending)")
let isSame = date1.compare(date2) == ComparisonResult.orderedSame
print("orderedSame: \(isSame)")
}
}
关于ios - 如何比较两个日期字符串的值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43211168/