在 Powershell 中将字符串转换为日期

Question

Today I met a problem with the conversion of this type of string "8/3/2020 10:29:33 AM" which I need to convert to date format.

I try this type of command and get an error every time:

$PwdExpiracy = "8/3/2020 10:29:33 AM"
$date = [datetime]::ParseExact($PwdExpiracy,'MM/dd/yyyy HH:mm:ss tt',$null)

The error is:

Exception calling "ParseExact" with "3" argument(s): "String was not recognized as a valid DateTime."
Au caractère Ligne:1 : 1
+ $date = [datetime]::ParseExact($PwdExpiracy,'MM/dd/yyyy HH:mm:ss tt',$nu ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : FormatException

Could you help me with this? That would be very kind of you!

Answer 1

You're using format specifiers for dates with leading zeroes and 24-hour time - change to the following:

$date = [datetime]::ParseExact($PwdExpiracy, 'M/d/yyyy hh:mm:ss tt', $null)

• M is the month without leading zeroes
• d is the day without leading zeroes
• hh is the hour in 12-hour time ( AM / PM )

---

If you still receive "String was not recognized as a valid DateTime." , try forcing ParseExact() to use the InvariantCulture (roughly equivalent to en-US locale), and it should accept it:

$date = [datetime]::ParseExact($PwdExpiracy, 'M/d/yyyy hh:mm:ss tt', [cultureinfo]::InvariantCulture)

Answer 2

Mathias R. Jessen said in a comment :

The exact same "String was not recognized as a valid DateTime." .

Can you try:

 [datetime]::ParseExact($PwdExpiracy,'M/d/yyyy hh:mm:ss tt',[cultureinfo]::InvariantCulture)

which worked for me.