Best date time between dates c#

best date time between dates c#

Fetch or Filter Data from Date to Date - Продолжительность: 17:35 C# Tutorial 54 971 просмотр SPSSisFun: Calculating the time difference between two dates - Продолжительность: 3:10 SPSSisFun 4 866 просмотров.

best date time between dates c#

Choosing between DateTime, DateTimeOffset, TimeSpan, and TimeZoneInfo • 04/10/2017 • 12 minutes to read • Contributors • • • • • • In this article .NET applications that use date and time information are very diverse and can use that information in several ways. The more common uses of date and time information include one or more of the following: • To reflect a date only, so that time information is not important. • To reflect a time only, so that date information is not important.

• To reflect an abstract date and time that is not tied to a specific time and place (for example, most stores in an international chain open on weekdays at 9:00 A.M.).

• To retrieve date and time information from sources outside of .NET, typically where date and time information is stored in a simple data type. • To uniquely and unambiguously identify a single point in time. Some applications require that a date and time be unambiguous only on the host system; others require that it be unambiguous across systems (that is, a date serialized on one system can be meaningfully deserialized and used on another system anywhere in the world).

• To preserve multiple related times (such as the requestor's local time and the server's time of receipt for a Web request). • To perform date and time arithmetic, possibly with a result that uniquely and unambiguously identifies a single point in time. .NET includes the , , , and types, all of which can be used to build applications that work with dates and times. Note This topic does not discuss a fourth type, , because its functionality is almost entirely incorporated in the class.

Whenever possible, developers should use the class instead of the class. The DateTime structure A value defines a particular date and time. It includes a property that provides limited information about the time zone to which that date and time belongs. The value returned by the property indicates whether the value represents the local time (), Coordinated Universal Time (UTC) (), or an unspecified time (). The structure is suitable for applications that do the following: • Work with dates only.

• Work with times only. • Work with abstract dates and times. • Work with dates and times for which time zone information is missing. • Work with UTC dates and times only. • Retrieve date and time information from sources outside of .NET, such as SQL databases. Typically, these sources store date and time information in a simple format that is compatible with the structure.

• Perform date and time arithmetic, but are concerned with general results. For example, in an addition operation that adds six months to a particular date and time, it is often not important whether the result is adjusted for daylight saving time. Unless a particular value represents UTC, that date and time value is often ambiguous or limited in its portability. For example, if a value represents the local time, it is portable within that local time zone (that is, if the value is deserialized on another system in the same time zone, that value still unambiguously identifies a single point in time).

Outside the local time zone, that value can have multiple interpretations. If the value's property is , it is even less portable: it is now ambiguous within the same time zone and possibly even on the same system on which it was first serialized.

Only if a value represents UTC does that value unambiguously identify a single point in time regardless of the system or time zone in which the value is used. Important When saving or sharing data, UTC should be used and the value's property should be set to .

The DateTimeOffset structure The structure represents a date and time value, together with an offset that indicates how much that value differs from UTC. Thus, the value always unambiguously identifies a single point in time. The type includes all of the functionality of the type along with time zone awareness. This makes it suitable for applications that do the following: • Uniquely and unambiguously identify a single point in time.

The type can be used to unambiguously define the meaning of "now", to log transaction times, to log the times of system or application events, and to record file creation and modification times.

• Perform general date and time arithmetic. • Preserve multiple related times, as long as those times are stored as two separate values or as two members of a structure. Note These uses for values are much more common than those for values.

As a result, should be considered the default date and time type for application development. A value is not tied to a particular time zone, but can originate from any of a variety of time zones. To illustrate this, the following example lists the time zones to which a number of values (including a local Pacific Standard Time) can belong. using System; using System.Collections.ObjectModel; public class TimeOffsets { public static void Main() { DateTime thisDate = new DateTime(2007, 3, 10, 0, 0, 0); DateTime dstDate = new DateTime(2007, 6, 10, 0, 0, 0); DateTimeOffset thisTime; thisTime = new DateTimeOffset(dstDate, new TimeSpan(-7, 0, 0)); ShowPossibleTimeZones(thisTime); thisTime = new DateTimeOffset(thisDate, new TimeSpan(-6, 0, 0)); ShowPossibleTimeZones(thisTime); thisTime = new DateTimeOffset(thisDate, new TimeSpan(+1, 0, 0)); ShowPossibleTimeZones(thisTime); } private static void ShowPossibleTimeZones(DateTimeOffset offsetTime) { TimeSpan offset = offsetTime.Offset; ReadOnlyCollection timeZones; Console.WriteLine("{0} could belong to the following time zones:", offsetTime.ToString()); // Get all time zones defined on local system timeZones = TimeZoneInfo.GetSystemTimeZones(); // Iterate time zones foreach (TimeZoneInfo timeZone in timeZones) { // Compare offset with offset for that date in that time zone if (timeZone.GetUtcOffset(offsetTime.DateTime).Equals(offset)) Console.WriteLine(" {0}", timeZone.DisplayName); } Console.WriteLine(); } } // This example displays the following output to the console: // 6/10/2007 12:00:00 AM -07:00 could belong to the following time zones: // (GMT-07:00) Arizona // (GMT-08:00) Pacific Time (US & Canada) // (GMT-08:00) Tijuana, Baja California // // 3/10/2007 12:00:00 AM -06:00 could belong to the following time zones: // (GMT-06:00) Central America // (GMT-06:00) Central Time (US & Canada) // (GMT-06:00) Guadalajara, Mexico City, Monterrey - New // (GMT-06:00) Guadalajara, Mexico City, Monterrey - Old // (GMT-06:00) Saskatchewan // // 3/10/2007 12:00:00 AM +01:00 could belong to the following time zones: // (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna // (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague // (GMT+01:00) Brussels, Copenhagen, Madrid, Paris // (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb // (GMT+01:00) West Central Africa Imports System.Collections.ObjectModel Module TimeOffsets Public Sub Main() Dim thisTime As DateTimeOffset thisTime = New DateTimeOffset(#06/10/2007#, New TimeSpan(-7, 0, 0)) ShowPossibleTimeZones(thisTime) thisTime = New DateTimeOffset(#03/10/2007#, New TimeSpan(-6, 0, 0)) ShowPossibleTimeZones(thisTime) thisTime = New DateTimeOffset(#03/10/2007#, New TimeSpan(+1, 0, 0)) ShowPossibleTimeZones(thisTime) End Sub Private Sub ShowPossibleTimeZones(offsetTime As DateTimeOffset) Dim offset As TimeSpan = offsetTime.Offset Dim timeZones As ReadOnlyCollection(Of TimeZoneInfo) Console.WriteLine("{0} could belong to the following time zones:", _ offsetTime.ToString()) ' Get all time zones defined on local system timeZones = TimeZoneInfo.GetSystemTimeZones() ' Iterate time zones For Each timeZone As TimeZoneInfo In timeZones ' Compare offset with offset for that date in that time zone If timeZone.GetUtcOffset(offsetTime.DateTime).Equals(offset) Then Console.WriteLine(" {0}", timeZone.DisplayName) End If Next Console.WriteLine() End Sub End Module ' This example displays the following output to the console: ' 6/10/2007 12:00:00 AM -07:00 could belong to the following time zones: ' (GMT-07:00) Arizona ' (GMT-08:00) Pacific Time (US & Canada) ' (GMT-08:00) Tijuana, Baja California ' ' 3/10/2007 12:00:00 AM -06:00 could belong to the following time zones: ' (GMT-06:00) Central America ' (GMT-06:00) Central Time (US & Canada) ' (GMT-06:00) Guadalajara, Mexico City, Monterrey - New ' (GMT-06:00) Guadalajara, Mexico City, Monterrey - Old ' (GMT-06:00) Saskatchewan ' ' 3/10/2007 12:00:00 AM +01:00 could belong to the following time zones: ' (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna ' (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague ' (GMT+01:00) Brussels, Copenhagen, Madrid, Paris ' (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb ' (GMT+01:00) West Central Africa The output shows that each date and time value in this example can belong to at least three different time zones.

The value of 6/10/2007 shows that if a date and time value represents a daylight saving time, its offset from UTC does not even necessarily correspond to the originating time zone's base UTC offset or to the offset from UTC found in its display name. This means that, because a single value is not tightly coupled with its time zone, it cannot reflect a time zone's transition to and from daylight saving time.

This can be particularly problematic when date and time arithmetic is used to manipulate a value. (For a discussion of how to perform date and time arithmetic in a way that takes account of a time zone's adjustment rules, see .) The TimeSpan structure The structure represents a time interval.

Its two typical uses are: • Reflecting the time interval between two date and time values. For example, subtracting one value from another returns a value. • Measuring elapsed time. For example, the property returns a value that reflects the time interval that has elapsed since the call to one of the methods that begins to measure elapsed time.

A value can also be used as a replacement for a value when that value reflects a time without reference to a particular time of day. This usage is similar to the and properties, which return a value that represents the time without reference to a date. For example, the structure can be used to reflect a store's daily opening or closing time, or it can be used to represent the time at which any regular event occurs. The following example defines a StoreInfo structure that includes objects for store opening and closing times, as well as a object that represents the store's time zone.

The structure also includes two methods, IsOpenNow and IsOpenAt, that indicates whether the store is open at a time specified by the user, who is assumed to be in the local time zone.

using System; public struct StoreInfo { public String store; public TimeZoneInfo tz; public TimeSpan open; public TimeSpan close; public bool IsOpenNow() { return IsOpenAt(DateTime.Now.TimeOfDay); } public bool IsOpenAt(TimeSpan time) { TimeZoneInfo local = TimeZoneInfo.Local; TimeSpan offset = TimeZoneInfo.Local.BaseUtcOffset; // Is the store in the same time zone?

if (tz.Equals(local)) { return time >= open & time = open & comparisonTime = open And time = open And comparisonTime <= close) End If End Function End Structure The StoreInfo structure can then be used by client code like the following. public class Example { public static void Main() { // Instantiate a StoreInfo object. var store103 = new StoreInfo(); store103.store = "Store #103"; store103.tz = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time"); // Store opens at 8:00.

store103.open = new TimeSpan(8, 0, 0); // Store closes at 9:30. store103.close = new TimeSpan(21, 30, 0); Console.WriteLine("Store is open now at {0}: {1}", DateTime.Now.TimeOfDay, store103.IsOpenNow()); TimeSpan[] times = { new TimeSpan(8, 0, 0), new TimeSpan(21, 0, 0), new TimeSpan(4, 59, 0), new TimeSpan(18, 31, 0) }; foreach (var time in times) Console.WriteLine("Store is open at {0}: {1}", time, store103.IsOpenAt(time)); } } // The example displays the following output: // Store is open now at 15:29:01.6129911: True // Store is open at 08:00:00: True // Store is open at 21:00:00: False // Store is open at 04:59:00: False // Store is open at 18:31:00: False Module Example Public Sub Main() ' Instantiate a StoreInfo object.

Dim store103 As New StoreInfo() store103.store = "Store #103" store103.tz = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time") ' Store opens at 8:00. store103.open = new TimeSpan(8, 0, 0) ' Store closes at 9:30.

store103.close = new TimeSpan(21, 30, 0) Console.WriteLine("Store is open now at {0}: {1}", Date.Now.TimeOfDay, store103.IsOpenNow()) Dim times() As TimeSpan = { New TimeSpan(8, 0, 0), New TimeSpan(21, 0, 0), New TimeSpan(4, 59, 0), New TimeSpan(18, 31, 0) } For Each time In times Console.WriteLine("Store is open at {0}: {1}", time, store103.IsOpenAt(time)) Next End Sub End Module ' The example displays the following output: ' Store is open now at 15:29:01.6129911: True ' Store is open at 08:00:00: True ' Store is open at 21:00:00: False ' Store is open at 04:59:00: False ' Store is open at 18:31:00: False The TimeZoneInfo class The class represents any of the Earth's time zones, and enables the conversion of any date and time in one time zone to its equivalent in another time zone.

The class makes it possible to work with dates and times so that any date and time value unambiguously identifies a single point in time. The class is also extensible. Although it depends on time zone information provided for Windows systems and defined in the registry, it supports the creation of custom time zones.

It also supports the serialization and deserialization of time zone information. In some cases, taking full advantage of the class may require further development work. If date and time values are not tightly coupled with the time zones to which they belong, further work is required. Unless your application provides some mechanism for linking a date and time with its associated time zone, it's easy for a particular date and time value to become disassociated from its time zone.

One method of linking this information is to define a class or structure that contains both the date and time value and its associated time zone object. Taking advantage of time zone support in .NET is possible only if the time zone to which a date and time value belongs is known when that date and time object is instantiated. This is often not the case, particularly in Web or network applications.

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best date time between dates c#

best date time between dates c# - Gets the days between. : Date Time Util���Date Time���C# / C Sharp


best date time between dates c#

I'm trying to find the time between two dates, one being the current day (Today) and the other, a user defined deadline. I'm working with C# Windows Forms and I've used a "date time picker" so that the user can choose a deadline date and I've created a string called Today and used string Today = System.DateTime.Today.ToString("dd-mm-yyyy"); as the current date. But I don't know how to find the length of time between these two points (since they're strings), my program is a simple "to do list" where task duration's are in days and weeks (the "yyyy" is just for aesthetic purposes, it can be removed if necessary).

I've had a look over the internet and all I can seem to find is how to do this with "DateTime"s, instead of strings (or am I missing something?). Any help would be greatly apreciated. -------------Problems Reply------------ Use the 'Value' property of your DateTimePicker to get the DateTime value and use DateTime.Now to get the DateTime value for the current time (in the local timezone).

If you are only subtracting dates (with no time component), access the Date property of both DateTime objects before subtracting. DateTime userDate = dateTimePicker.Value.Date; DateTime currentDate = DateTime.Now.Date; TimeSpan difference = userDate.Subtract(currentDate); //assuming deadline is in the future Don't use two strings - use the actual DateTime instances. Strings don't and can't "understand" dates - that's why the DateTime object exists. When you subtract two dates from each other, you get a TimeSpan instance.

This gives you the amount of time difference. TimeSpan difference = date1 - date2; I guess the following you are looking for: Date1.Subtract(Date2).TotalTime Following link will help you understand more http://www.c-sharpcorner.com/UploadFile/DipalChoksi/DateDiff_CS_DC09132006172429PM/DateDiff_CS_DC.aspx AS Oded mentions the string is not the best approach.

DateTimes cann be substracted from one another and give you a TimeSpan that represents, well, that, a time span. Here is an MSDN example that should clarify things. DateTime departure = new DateTime(2010, 6, 12, 18, 32, 0); DateTime arrival = new DateTime(2010, 6, 13, 22, 47, 0); TimeSpan travelTime = arrival - departure; Console.WriteLine("{0} - {1} = {2}", arrival, departure, travelTime); // The example displays the following output: // 6/13/2010 10:47:00 PM - 6/12/2010 6:32:00 PM = 1.04:15:00 Category: Views: 2 Time:2012-04-28


best date time between dates c#

Hi All, I'm fairly new to programming so I hope this question isn't too basic for you all. I'm writing a program and part of it needs to calculate the time difference in Months, Days, Minutes, Seconds from Now and a date in the future (that the user has previously entered and is stored in a variable). I was wondering if anyone has any idea on how to go about this? Basically the user is asked for a certain date in the future (their birthday), which is stored in variable userDate. The program then gets the dateTime.Now date and calculates this, then displays Months=a, weeks=b, days=c, hours=d (where a,b,c,d are the relevant numbers calculated).

i look forward to any ideas people have. Many thanks Paul


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