Question

在C＃中将两个整数解析为datetime时遇到问题。我有两个整数，如下所示：

int day = 25;
int month = 08; 
var currentYear = DateTime.Now.Year;

var scheduledDate = "25/08/2018";

我想要的是将day, month and the current year转换为格式dd/MM/yyyy，然后将此日期与格式为dd/MM/yyyy的scheduleDate进行比较。有人可以帮我吗？

Answer 1

您应该始终将let myfriends = ["Ted", "Robyn", "Barney", "Lily", "Marshall"] i = 1; while i <= length(myfriends) # this function here seems to work no problem friend = myfriends[i] println("Hi $friend, it's great to see you!") i = i + 1 # gives syntax error when prefixed with global end end转换为DateTime对象，然后进行比较，而不是将String对象转换为String。

DateTime

Answer 2

var yourDateTime = new DateTime(currentYear, month, day);
var yourDateString = yourDateTime.ToString("dd/MM/yyyy");
// compare

Answer 3

如果只想比较日期，则可以使用Date的{{1}}属性

DateTime

POC：.Net Fiddler

Answer 4

尝试以下操作，您可以使用DateTime.ToString()方法将其转换为所需的format。

int day = 25;
int month = 08;
var currentYear = DateTime.Now.Year;

var date = new DateTime(DateTime.Now.Year, month, day);
var formattedDate = date.ToString("dd/MM/yyyy");

var scheduledDate = "25/08/2018";

// Compare formattedDate and scheduledDate

OR

如果更合适，您可以考虑将scheduleDate字符串转换为日期时间并比较日期时间对象：

var scheduledDate = "25/08/2018";
var parsedDate = DateTime.ParseExact(scheduledDate, "dd/MM/yyyy", CultureInfo.InvariantCulture);

var date = new DateTime(DateTime.Now.Year, month, day);

// compare date & parsed date
bool areEqual = date.Equals(parsedDate);

Answer 5

如果我理解您的问题，只需将进行中的操作保持为零，

int day = 25;
int month = 08;
var currentYear = DateTime.Now.Year;            
var targetDate = $"{day}/{month.ToString().PadLeft(2,'0')}/{currentYear}";
var scheduledDate = "25/08/2018";
var difference = DateTime.Compare(DateTime.Parse(targetDate), 
DateTime.Parse(scheduledDate));

Answer 6

如果只想将其转换为字符串，这应该是最简单的方法：

int day = 25;
int month = 08;
var currentYear = DateTime.Now.Year;

// {day:D2} is equivalent to day.ToString("D2") which pads integers to a length of two
var createdDate = $"{day:D2}/{month:D2}/{currentYear}";

var scheduledDate = "25/08/2018";

编辑
整理一下人们在这里所说的一些内容，将它们都解析为DateTime可能更适合于比较部分：

DateTime createdDateTime = new DateTime(currentYear, month, day);

DateTime scheduledDateTime = DateTime.ParseExact(scheduledDate, "dd/MM/yyyy", CultureInfo.InvariantCulture);

// Compare if it's the same day
if (createdDateTime.Date == scheduledDateTime.Date)
{
    // do stuff
}

// Get the difference in Days
int dayDifference = (createdDateTime - scheduledDateTime).Days;

或者用.TotalDays代替.Days返回double

Answer 7

int day = 25;
int month = 08; 
var currentYear = DateTime.Now.Year;

var scheduledDate = "25/08/2018";

// parse string into DateTime structure
var ci = new CultureInfo("en-UK");
var dtScheduledDate = DateTime.Parse(scheduledDate, ci);

var dtOther = new DateTime(currentYear, month, day);

if(dtOther > dtScheduledDate)
{
  ...
}

Answer 8

在这种情况下，如果变量scheduleDate是字符串，则可以将其他变量(day,month and currentYear)转换为所需格式的字符串：

var dt = day + "/" + month  + "/" + currentYear;

因此，您可以这样做：

if(dt.Equals(scheduleDate))
 //Do some
else
 //other thing

Answer 9

static void Main(string[] args)
{

    int transactionDate = 20201010;
    int? transactionTime = 210000;

    var agreementDate = DateTime.Today;
    var previousDate = agreementDate.AddDays(-1);

    var agreementHour = 22;
    var agreementMinute = 0;
    var agreementSecond = 0;

    var startDate = new DateTime(previousDate.Year, previousDate.Month, previousDate.Day, agreementHour, agreementMinute, agreementSecond);
    var endDate = new DateTime(agreementDate.Year, agreementDate.Month, agreementDate.Day, agreementHour, agreementMinute, agreementSecond);

    DateTime selectedDate = Convert.ToDateTime(transactionDate.ToString().Substring(6, 2) + "/" + transactionDate.ToString().Substring(4, 2) + "/" + transactionDate.ToString().Substring(0, 4) + " " + string.Format("{0:00:00:00}", transactionTime));

    Console.WriteLine("Selected Date : " + selectedDate.ToString());
    Console.WriteLine("Start Date : " + startDate.ToString());
    Console.WriteLine("End Date : " + endDate.ToString());

    if (selectedDate > startDate && selectedDate <= endDate)
        Console.WriteLine("Between two dates..");
    else if (selectedDate <= startDate)
        Console.WriteLine("Less than or equal to the start date!");
    else if (selectedDate > endDate)
        Console.WriteLine("Greater than end date!");
    else
        Console.WriteLine("Out of date ranges!");
}

输出：选择日期：10.10.2020 21:00:00 开始日期：8.10.2020 22:00:00 结束日期：9.10.2020 22:00:00 大于结束日期！

将整数转换为日期时间并在C＃中比较日期

9 个答案: