本文整理汇总了VB.NET中System.DateTimeOffset.ParseExact方法的典型用法代码示例。如果您正苦于以下问题:VB.NET DateTimeOffset.ParseExact方法的具体用法?VB.NET DateTimeOffset.ParseExact怎么用?VB.NET DateTimeOffset.ParseExact使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.DateTimeOffset
的用法示例。
在下文中一共展示了DateTimeOffset.ParseExact方法的5个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: formats
Dim conIn As TextReader = Console.In
Dim conOut As TextWriter = Console.Out
Dim tries As Integer = 0
Dim input As String = String.Empty
Dim formats() As String = {"M/dd/yyyy HH:m zzz", "MM/dd/yyyy HH:m zzz", _
"M/d/yyyy HH:m zzz", "MM/d/yyyy HH:m zzz", _
"M/dd/yy HH:m zzz", "MM/dd/yy HH:m zzz", _
"M/d/yy HH:m zzz", "MM/d/yy HH:m zzz", _
"M/dd/yyyy H:m zzz", "MM/dd/yyyy H:m zzz", _
"M/d/yyyy H:m zzz", "MM/d/yyyy H:m zzz", _
"M/dd/yy H:m zzz", "MM/dd/yy H:m zzz", _
"M/d/yy H:m zzz", "MM/d/yy H:m zzz", _
"M/dd/yyyy HH:mm zzz", "MM/dd/yyyy HH:mm zzz", _
"M/d/yyyy HH:mm zzz", "MM/d/yyyy HH:mm zzz", _
"M/dd/yy HH:mm zzz", "MM/dd/yy HH:mm zzz", _
"M/d/yy HH:mm zzz", "MM/d/yy HH:mm zzz", _
"M/dd/yyyy H:mm zzz", "MM/dd/yyyy H:mm zzz", _
"M/d/yyyy H:mm zzz", "MM/d/yyyy H:mm zzz", _
"M/dd/yy H:mm zzz", "MM/dd/yy H:mm zzz", _
"M/d/yy H:mm zzz", "MM/d/yy H:mm zzz"}
Dim provider As IFormatProvider = CultureInfo.InvariantCulture.DateTimeFormat
Dim result As DateTimeOffset
Do
conOut.WriteLine("Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),")
conOut.Write("Then press Enter: ")
input = conIn.ReadLine()
conOut.WriteLine()
Try
result = DateTimeOffset.ParseExact(input, formats, provider, _
DateTimeStyles.AllowWhiteSpaces)
Exit Do
Catch e As FormatException
Console.WriteLine("Unable to parse {0}.", input)
tries += 1
End Try
Loop While tries < 3
If tries >= 3 Then
Console.WriteLine("Exiting application without parsing {0}", input)
Else
Console.WriteLine("{0} was converted to {1}", input, result.ToString())
End If
' Some successful sample interactions with the user might appear as follows:
' Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),
' Then press Enter: 12/08/2007 6:54 -6:00
'
' 12/08/2007 6:54 -6:00 was converted to 12/8/2007 6:54:00 AM -06:00
'
' Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),
' Then press Enter: 12/8/2007 06:54 -06:00
'
' 12/8/2007 06:54 -06:00 was converted to 12/8/2007 6:54:00 AM -06:00
'
' Enter a date, time, and offset (MM/DD/YYYY HH:MM +/-HH:MM),
' Then press Enter: 12/5/07 6:54 -6:00
'
' 12/5/07 6:54 -6:00 was converted to 12/5/2007 6:54:00 AM -06:00
示例2:
Dim dateString, format As String
Dim result As DateTimeOffset
Dim provider As CultureInfo = CultureInfo.InvariantCulture
' Parse date-only value with invariant culture and assume time is UTC.
dateString = "06/15/2008"
format = "d"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider, _
DateTimeStyles.AssumeUniversal)
Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try
' Parse date-only value with leading white space.
' Should throw a FormatException because only trailing white space is
' specified in method call.
dateString = " 06/15/2008"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider, _
DateTimeStyles.AllowTrailingWhite)
Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try
' Parse date and time value, and allow all white space.
dateString = " 06/15/ 2008 15:15 -05:00"
format = "MM/dd/yyyy H:mm zzz"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider, _
DateTimeStyles.AllowWhiteSpaces)
Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try
' Parse date and time and convert to UTC.
dateString = " 06/15/2008 15:15:30 -05:00"
format = "MM/dd/yyyy H:mm:ss zzz"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider, _
DateTimeStyles.AllowWhiteSpaces Or _
DateTimeStyles.AdjustToUniversal)
Console.WriteLine("'{0}' converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("'{0}' is not in the correct format.", dateString)
End Try
输出:
06/15/2008' converts to 6/15/2008 12:00:00 AM +00:00. 06/15/2008' is not in the correct format. 06/15/ 2008 15:15 -05:00' converts to 6/15/2008 3:15:00 PM -05:00. 06/15/2008 15:15:30 -05:00' converts to 6/15/2008 8:15:30 PM +00:00.
示例3: Example
' 导入命名空间
Imports System.Globalization
Public Module Example
Public Sub Main()
Dim dateStrings() = { "2018-08-18T12:45:16.0000000Z",
"2018/08/18T12:45:16.0000000Z",
"2018-18-08T12:45:16.0000000Z",
"2018-08-18T12:45:16.0000000",
" 2018-08-18T12:45:16.0000000Z ",
"2018-08-18T12:45:16.0000000+02:00",
"2018-08-18T12:45:16.0000000-07:00" }
ParseWithISO8601(dateStrings, DateTimeStyles.None)
Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
ParseWithISO8601(dateStrings, DateTimeStyles.AllowWhiteSpaces)
Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
ParseWithISO8601(dateStrings, DateTimeStyles.AdjustToUniversal)
Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
ParseWithISO8601(dateStrings, DateTimeStyles.AssumeLocal)
Console.WriteLine($"{vbCrLf}-----{vbCrLf}")
ParseWithISO8601(dateStrings, DateTimeStyles.AssumeUniversal)
End Sub
Private Sub ParseWithISO8601(dateStrings() As String, styles As DateTimeStyles)
Console.WriteLine($"Parsing with {styles}:")
For Each dateStr In dateStrings
Try
Dim dat = DateTimeOffset.ParseExact(dateString, "O", Nothing, styles)
Console.WriteLine($" {dateString,-35} --> {dat:yyyy-MM-dd HH:mm:ss.FF zzz}")
catch e As FormatException
Console.WriteLine($" FormatException: Unable to convert '{dateString}'")
End Try
Next
End Sub
End Module
输出:
Parsing with None: FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' ----- Parsing with AllowWhiteSpaces: FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' ----- Parsing with AdjustToUniversal: FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' ----- Parsing with AssumeLocal: FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' ----- Parsing with AssumeUniversal: FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018' FormatException: Unable to convert '07-30-2018'
示例4:
Dim dateString, format As String
Dim result As DateTimeOffset
Dim provider As CultureInfo = CultureInfo.InvariantCulture
' Parse date-only value with invariant culture.
dateString = "06/15/2008"
format = "d"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider)
Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("{0} is not in the correct format.", dateString)
End Try
' Parse date-only value without leading zero in month using "d" format.
' Should throw a FormatException because standard short date pattern of
' invariant culture requires two-digit month.
dateString = "6/15/2008"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider)
Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("{0} is not in the correct format.", dateString)
End Try
' Parse date and time with custom specifier.
dateString = "Sun 15 Jun 2008 8:30 AM -06:00"
format = "ddd dd MMM yyyy h:mm tt zzz"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider)
Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("{0} is not in the correct format.", dateString)
End Try
' Parse date and time with offset without offset's minutes.
' Should throw a FormatException because "zzz" specifier requires leading
' zero in hours.
dateString = "Sun 15 Jun 2008 8:30 AM -06"
Try
result = DateTimeOffset.ParseExact(dateString, format, provider)
Console.WriteLine("{0} converts to {1}.", dateString, result.ToString())
Catch e As FormatException
Console.WriteLine("{0} is not in the correct format.", dateString)
End Try
输出:
06/15/2008 converts to 6/15/2008 12:00:00 AM -07:00. 6/15/2008 is not in the correct format. Sun 15 Jun 2008 8:30 AM -06:00 converts to 6/15/2008 8:30:00 AM -06:00. Sun 15 Jun 2008 8:30 AM -06 is not in the correct format.
示例5: Example
Public Module Example
Public Sub Main()
Dim dateStrings() As String = { "2018-08-18T12:45:16.0000000Z",
"2018/08/18T12:45:16.0000000Z",
"2018-18-08T12:45:16.0000000Z",
" 2018-08-18T12:45:16.0000000Z ",
"2018-08-18T12:45:16.0000000+02:00",
"2018-08-18T12:45:16.0000000-07:00" }
For Each dateStr In dateStrings
Try
Dim dat = DateTimeOffset.ParseExact(dateStr, "O", Nothing)
Console.WriteLine($"{dateStr,-35} --> {dat:yyyy-MM-dd HH:mm:ss.FF zzz}")
Catch e As FormatException
Console.WriteLine($"FormatException: Unable to convert '{dateStr}'")
End Try
Next
End Sub
End Module
输出:
2018-08-18T12:45:16.0000000Z --> 2018-08-18 12:45:16 +00:00 FormatException: Unable to convert '2018/08/18T12:45:16.0000000Z' FormatException: Unable to convert '2018-18-08T12:45:16.0000000Z' FormatException: Unable to convert ' 2018-08-18T12:45:16.0000000Z ' 2018-08-18T12:45:16.0000000+02:00 --> 2018-08-18 12:45:16 +02:00 2018-08-18T12:45:16.0000000-07:00 --> 2018-08-18 12:45:16 -07:00