Checking for valid datetime

[Mike P]

How do I check for a valid datetime, where both the date and the time
must be entered in the format DD/MM/YYYY HH:MM? Using
Convert.ToDateTime would work
even if a time is not added so I can't use this?


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[Paul E Collins]

"Mike P" <mi*******@gmail.comwrote:

How do I check for a valid datetime, where both the date and the time
must be entered in the format DD/MM/YYYY HH:MM?

DateTime.ParseExact.

I think your format string will be "dd/MM/yyyy HH:mm"

Eq.

[Marc Gravell]

Another approach; parse it, and then call ToString() specifying the
format you expected. If the "before" and "after" strings aren't the
same, then the input wasn't valid.

Marc

[Jon Skeet [C# MVP]]

On Jun 3, 9:50 am, "Paul E Collins" <[e-mail]>
wrote:

"Mike P" <[e-mail]:

How do I check for a valid datetime, where both the date and the time
must be entered in the format DD/MM/YYYY HH:MM?

DateTime.ParseExact.

Or DateTime.TryParseExact for checking purposes.

I think your format string will be "dd/MM/yyyy HH:mm"

Agreed.

Jon

[Mike P]

In this code example I have found, what classes do I need to reference
to get at DateTimeFormatInfo and DateTimeStyles objects?

DateTime validatedDate;
bool valid = DateTime.TryParseExact(date, date_format,
DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out
validatedDate);
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[Jon Skeet [C# MVP]]

On Jun 3, 10:57 am, Mike P <[e-mail]:

In this code example I have found, what classes do I need to reference
to get at DateTimeFormatInfo and DateTimeStyles objects?

DateTime validatedDate;
bool valid = DateTime.TryParseExact(date, date_format,
DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out
validatedDate);

I think you mean the namespace - and System.Globalization is what
you're after.

If you just write the code above though, and put the edit caret in
DateTimeStyles or DateTimeFormatInfo, then hit Ctrl-period, it should
offer to import the right namespace for you. This can be a real time-
saver.

Jon

[Ignacio Machin ( .NET/ C# MVP )]

On Jun 3, 5:57*am, Mike P <[e-mail]:

In this code example I have found, what classes do I need to reference
to get at DateTimeFormatInfo and DateTimeStyles objects?

DateTime validatedDate;
bool valid = DateTime.TryParseExact(date, date_format,
DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out
validatedDate);

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Hi,

If you want to know the namespace of a class all you have to do is
type it in MSDN lib, you will get it in the "About" section.
Those classes are in System.Globalization BTW