VB.NET TUTORIALS - VB.Net - Date & Time
VB.Net - Date & Time
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Note: Both the DateTime structure and the DateAndTime module contain properties like Now and Today, so often beginners find it confusing. The DateAndTime class belongs to the Microsoft.VisualBasic namespace and the DateTime structure belongs to the System namespace. Therefore, using the later would help you in porting your code to another .Net language like C#. However, the DateAndTime class/module contains all the legacy date functions available in Visual Basic. |
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Properties and Methods of the DateTime Structure
S.N | Property | Description |
---|---|---|
1 | Date | Gets the date component of this instance. |
2 | Day | Gets the day of the month represented by this instance. |
3 | DayOfWeek | Gets the day of the week represented by this instance. |
4 | DayOfYear | Gets the day of the year represented by this instance. |
5 | Hour | Gets the hour component of the date represented by this instance. |
6 | Kind | Gets a value that indicates whether the time represented by this instance is based on local time, Coordinated Universal Time (UTC), or neither. |
7 | Millisecond | Gets the milliseconds component of the date represented by this instance. |
8 | Minute | Gets the minute component of the date represented by this instance. |
9 | Month | Gets the month component of the date represented by this instance. |
10 | Now | Gets a DateTime object that is set to the current date and time on this computer, expressed as the local time. |
11 | Second | Gets the seconds component of the date represented by this instance. |
12 | Ticks | Gets the number of ticks that represent the date and time of this instance. |
13 | TimeOfDay | Gets the time of day for this instance. |
14 | Today | Gets the current date. |
15 | UtcNow | Gets a DateTime object that is set to the current date and time on this computer, expressed as the Coordinated Universal Time (UTC). |
16 | Year | Gets the year component of the date represented by this instance. |
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S.N | Method Name & Description |
---|---|
1 | Public Function Add (
value As TimeSpan
) As DateTime
Returns a new DateTime that adds the value of the specified TimeSpan to the value of this instance. |
2 | Public Function AddDays (
value As Double
) As DateTime
Returns a new DateTime that adds the specified number of days to the value of this instance. |
3 | Public Function AddHours (
value As Double
) As DateTime
Returns a new DateTime that adds the specified number of hours to the value of this instance. |
4 | Public Function AddMinutes (
value As Double
) As DateTime
Returns a new DateTime that adds the specified number of minutes to the value of this instance. |
5 | Public Function AddMonths (
months As Integer
) As DateTime
Returns a new DateTime that adds the specified number of months to the value of this instance. |
6 | Public Function AddSeconds (
value As Double
) As DateTime
Returns a new DateTime that adds the specified number of seconds to the value of this instance. |
7 | Public Function AddYears (
value As Integer
) As DateTime
Returns a new DateTime that adds the specified number of years to the value of this instance. |
8 | Public Shared Function Compare (
t1 As DateTime,
t2 As DateTime
) As Integer
Compares two instances of DateTime and returns an integer that indicates whether the first instance is earlier than, the same as, or later than the second instance. |
9 | Public Function CompareTo (
value As DateTime
) As Integer
Compares the value of this instance to a specified DateTime value and returns an integer that indicates whether this instance is earlier than, the same as, or later than the specified DateTime value. |
10 | Public Function Equals (
value As DateTime
) As Boolean
Returns a value indicating whether the value of this instance is equal to the value of the specified DateTime instance. |
11 | Public Shared Function Equals (
t1 As DateTime,
t2 As DateTime
) As Boolean
Returns a value indicating whether two DateTime instances have the same date and time value. |
12 | Public Overrides Function ToString As String
Converts the value of the current DateTime object to its equivalent string representation. |
Predefined Date/Time Formats
Format | Description |
---|---|
General Date, or G | Displays a date and/or time. For example, 1/12/2012 07:07:30 AM. |
Long Date,Medium Date, or D | Displays a date according to your current culture's long date format. For example, Sunday, December 16, 2012. |
Short Date, or d | Displays a date using your current culture's short date format. For example, 12/12/2012. |
Long Time,Medium Time, orT | Displays a time using your current culture's long time format; typically includes hours, minutes, seconds. For example, 01:07:30 AM. |
Short Time or t | Displays a time using your current culture's short time format. For example, 11:07 AM. |
f | Displays the long date and short time according to your current culture's format. For example, Sunday, December 16, 2012 12:15 AM. |
F | Displays the long date and long time according to your current culture's format. For example, Sunday, December 16, 2012 12:15:31 AM. |
g | Displays the short date and short time according to your current culture's format. For example, 12/16/2012 12:15 AM. |
M, m | Displays the month and the day of a date. For example, December 16. |
R, r | Formats the date according to the RFC1123Pattern property. |
s | Formats the date and time as a sortable index. For example, 2012-12-16T12:07:31. |
u | Formats the date and time as a GMT sortable index. For example, 2012-12-16 12:15:31Z. |
U | Formats the date and time with the long date and long time as GMT. For example, Sunday, December 16, 2012 6:07:31 PM. |
Y, y | Formats the date as the year and month. For example, December, 2012. |
Properties and Methods of the DateAndTime Class
S.N | Property | Description |
---|---|---|
1 | Date | Returns or sets a String value representing the current date according to your system. |
2 | Now | Returns a Date value containing the current date and time according to your system. |
3 | TimeOfDay | Returns or sets a Date value containing the current time of day according to your system. |
4 | Timer | Returns a Double value representing the number of seconds elapsed since midnight. |
5 | TimeString | Returns or sets a String value representing the current time of day according to your system. |
6 | Today | Gets the current date. |
S.N | Method Name & Description |
---|---|
1 | Public Shared Function DateAdd (
Interval As DateInterval,
Number As Double,
DateValue As DateTime
) As DateTime
Returns a Date value containing a date and time value to which a specified time interval has been added. |
2 | Public Shared Function DateAdd (
Interval As String,
Number As Double,
DateValue As Object
) As DateTime
Returns a Date value containing a date and time value to which a specified time interval has been added. |
3 | Public Shared Function DateDiff (
Interval As DateInterval,
Date1 As DateTime,
Date2 As DateTime,
DayOfWeek As FirstDayOfWeek,
WeekOfYear As FirstWeekOfYear
) As Long
Returns a Long value specifying the number of time intervals between two Date values. |
4 | Public Shared Function DatePart (
Interval As DateInterval,
DateValue As DateTime,
FirstDayOfWeekValue As FirstDayOfWeek,
FirstWeekOfYearValue As FirstWeekOfYear
) As Integer
Returns an Integer value containing the specified component of a given Date value. |
5 | Public Shared Function Day (
DateValue As DateTime
) As Integer
Returns an Integer value from 1 through 31 representing the day of the month. |
6 | Public Shared Function Hour (
TimeValue As DateTime
) As Integer
Returns an Integer value from 0 through 23 representing the hour of the day. |
7 | Public Shared Function Minute (
TimeValue As DateTime
) As Integer
Returns an Integer value from 0 through 59 representing the minute of the hour. |
8 | Public Shared Function Month (
DateValue As DateTime
) As Integer
Returns an Integer value from 1 through 12 representing the month of the year. |
9 | Public Shared Function MonthName (
Month As Integer,
Abbreviate As Boolean
) As String
Returns a String value containing the name of the specified month. |
10 | Public Shared Function Second (
TimeValue As DateTime
) As Integer
Returns an Integer value from 0 through 59 representing the second of the minute. |
11 | Public Overridable Function ToString As String
Returns a string that represents the current object. |
12 | Public Shared Function Weekday (
DateValue As DateTime,
DayOfWeek As FirstDayOfWeek
) As Integer
Returns an Integer value containing a number representing the day of the week. |
13 | Public Shared Function WeekdayName (
Weekday As Integer,
Abbreviate As Boolean,
FirstDayOfWeekValue As FirstDayOfWeek
) As String
Returns a String value containing the name of the specified weekday. |
14 | Public Shared Function Year (
DateValue As DateTime
) As Integer
Returns an Integer value from 1 through 9999 representing the year. |
'Declaration <SerializableAttribute> _ Public Structure DateTime _ Implements IComparable, IFormattable, IConvertible, ISerializable, IComparable(Of DateTime), IEquatable(Of DateTime)
'Declaration <StandardModuleAttribute> _ Public NotInheritable Class DateAndTimeCreating a DateTime Object
Module Module1 Sub Main() 'DateTime constructor: parameters year, month, day, hour, min, sec Dim date1 As New Date(2012, 12, 16, 12, 0, 0) 'initializes a new DateTime value Dim date2 As Date = #12/16/2012 12:00:52 AM# 'using properties Dim date3 As Date = Date.Now Dim date4 As Date = Date.UtcNow Dim date5 As Date = Date.Today Console.WriteLine(date1) Console.WriteLine(date2) Console.WriteLine(date3) Console.WriteLine(date4) Console.WriteLine(date5) Console.ReadKey() End Sub End ModuleGetting the Current Date and Time:
Module dateNtime Sub Main() Console.Write("Current Time: ") Console.WriteLine(Now.ToLongTimeString) Console.ReadKey() End Sub End Module
Module dateNtime Sub Main() Console.WriteLine("Current Date: ") Dim dt As Date = Today Console.WriteLine("Today is: {0}", dt) Console.ReadKey() End Sub End ModuleFormatting Date
Module dateNtime Sub Main() Console.WriteLine("India Wins Freedom: ") Dim independenceDay As New Date(1947, 8, 15, 0, 0, 0) ' Use format specifiers to control the date display. Console.WriteLine(" Format 'd:' " & independenceDay.ToString("d")) Console.WriteLine(" Format 'D:' " & independenceDay.ToString("D")) Console.WriteLine(" Format 't:' " & independenceDay.ToString("t")) Console.WriteLine(" Format 'T:' " & independenceDay.ToString("T")) Console.WriteLine(" Format 'f:' " & independenceDay.ToString("f")) Console.WriteLine(" Format 'F:' " & independenceDay.ToString("F")) Console.WriteLine(" Format 'g:' " & independenceDay.ToString("g")) Console.WriteLine(" Format 'G:' " & independenceDay.ToString("G")) Console.WriteLine(" Format 'M:' " & independenceDay.ToString("M")) Console.WriteLine(" Format 'R:' " & independenceDay.ToString("R")) Console.WriteLine(" Format 'y:' " & independenceDay.ToString("y")) Console.ReadKey() End Sub End ModuleProperties and Methods of the DateAndTime Class
Module Module1 Sub Main() Dim birthday As Date Dim bday As Integer Dim month As Integer Dim monthname As String ' Assign a date using standard short format. birthday = #7/27/1998# bday = Microsoft.VisualBasic.DateAndTime.Day(birthday) month = Microsoft.VisualBasic.DateAndTime.Month(birthday) monthname = Microsoft.VisualBasic.DateAndTime.MonthName(month) Console.WriteLine(birthday) Console.WriteLine(bday) Console.WriteLine(month) Console.WriteLine(monthname) Console.ReadKey() End Sub End Module