无法验证 ISO 8601 日期格式的日期字符串

Question

在asp.net中Date.Now生成一个完整的日期字符串：例如 "2018-01-17T11:12:42.0544453+00:00"

我无法使用以下格式验证此日期字符串。谁能建议合适的验证格式？

Dim formats() As String = {
  "yyyy-MM-dd",
  "yyyy-MM-ddTHH:mm:ss",
  "yyyy-MM-ddTHH:mm:ss.fff",
  "yyyy-mm-ddThh:mm:ss.ffffff",
  "yyyy-mm-ddThh:mm:ss.fffffffZ",
  "yyyy-mm-ddThh:mm:ss.nnnnnnn",
  "yyyy-mm-ddThh:mm:ss.nnnnnnnZ",
  "yyyy-mm-ddThh:mm:ss.nnnnnnn+|-hh:mm"
}
If Date.TryParseExact("2018-01-17T11:12:42.0544453+00:00", formats, CultureInfo.InvariantCulture, DateTimeStyles.None, dt) Then
  //Success
End If

Answer 1

I want to ensure the date is a valid ISO 8601 date format. This can be true even when time/fractions/timeszones are omitted.

您可以使用 "O"(Round-trip) format specifier

Dim time = "2018-01-17T11:12:42.0544453+00:00"
Dim validDate = Date.TryParseExact(time, "O", CultureInfo.InvariantCulture, DateTimeStyles.None, dt)

The "O" or "o" standard format specifier represents a custom date and time format string using a pattern that preserves time zone information and emits a result string that complies with ISO 8601. For DateTime values, this format specifier is designed to preserve date and time values along with the DateTime.Kind property in text. ...

旁注：对我来说 Date.Now.ToString 没有 return 这种格式的字符串。也许你用过：

Dim time = Date.UtcNow.ToString("o", System.Globalization.CultureInfo.InvariantCulture)

无法验证 ISO 8601 日期格式的日期字符串

Unable to validate a date string in ISO 8601 date format

.net

vb.net

date

datetime

iso8601