Converting the WhenChanged attribute (Generalized-Time) in LDAP to a DateTime in C#

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I recently switch from using S.DS namespace (which uses ADSI) to the S.SD.Protocol namespace. The only problem is that ADSI handled the conversion of Generalized-Time to a DateTime for me. Now I'm getting back a value of "20070828085401.0Z" for the WhenChanged attribute. DateTime.Parse() will not convert this so is there another way?

The format you are getting is close to the round trip date time pattern ("o") and universal sortable round trip date time pattern ("u") standard date time format strings as described here.

One kludgy solution would be to massage the string you get to fit the pattern and then use the "o" or "u" standard format string with ParseExact.

A better way would be to construct a custom format string that matches the data you are already getting. In the "How Standard Format Strings Work" section of the standard date time format strings page you'll see the full custom formatting strings equivalent to "o" and "u". That should give you a good start.

EDIT: Add code

string format = "yyyyMMddHHmmss.f'Z'";

string target = "20070828085401.0Z";

DateTime d = DateTime.ParseExact(target, format, CultureInfo.InvariantCulture);

In the comments lixonn observes that, using the format string above, ParseExact will not successfully parse a time string like 199412160532-0500.

It also won't parse a number of other valid strings such as times without the trailing 'Zulu' indicator (20070828085401.0); times without a fractional part (20070828085401Z) and times that represent minutes and seconds as a fractional hour (2007082808.90028Z).

The format string can be made slightly more forgiving by replacing the hard-coded 'Z' with the K custom specifier which will accept 'Z', an offset like -0500, and nothing. Whether that additional flexibility is a good thing will depend on your application.

Note that even with the K specifier Lixonn's string won't be parsed successfully since it lacks a fractional part to match the .f component of the format string.

Active Directory: Generalized-Time Attributes, Converting the WhenChanged attribute (Generalized-Time) in LDAP to a DateTime in C#. c# datetime ldap. I recently switch from using S.DS namespace (​which  I currently have an ldap query in a stored procedure that is working fine but is checking the 'whenCreated' attribute against a hardcoded data. SELECT * FROM OpenQuery ( ADSI

You'll have to use DateTime.ParseExact() specifying the exact format. You might have to play with the format a little bit but it would be something like this.

DateTime result;
CultureInfo provider = CultureInfo.InvariantCulture;
string format="yyyyMMddhhmmss.0Z";
result = DateTime.ParseExact(dateString, format, provider);

GeneralizedTime, Converting the WhenChanged attribute (Generalized-Time) in LDAP to a DateTime in C# - c#. Convert 18-digit LDAP/FILETIME timestamps to human-readable date. The 18-digit Active Directory timestamps, also named 'Windows NT time format', 'Win32 FILETIME or SYSTEMTIME' or NTFS file time. These are used in Microsoft Active Directory for pwdLastSet, accountExpires, LastLogon, LastLogonTimestamp, and LastPwdSet.

You can use datetime's .strptime().

    import datetime

    # Since 0Z denotes UTC, you can get rid of it and apply the timezone 
    # later if you would like
    time_string = "20070828085401.0Z".split('.')[0]
    time_object = datetime.datetime.strptime(time_string, "%Y%m%d%H%M%S")

time_object should output as datetime.datetime(2007, 8, 28, 8, 54, 1). I believe it will be timezone naive, and equivalent to UTC time.

LDAP, Active Directory & Filetime Timestamp Converter, A value of the GeneralizedTime LDAPSyntaxes is a character string representing a date and time. GeneralizedTime is also an ASN.1 Data type. The LDAP-specific​  Some examples of Active Directory attributes that store date/time values are LastLogon, LastLogonTimestamp, accountExpires, and LastPwdSet. In order to obtain the date/time value stored in these attributes into a standard format, some conversion is required. This article describes how this conversion can be done.

// WIN32 FILETIME is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC).
// While the unix timestamp represents the seconds since January 1, 1970 (UTC).
private static long Win32FileTimeToUnixTimestamp(long fileTime)
    //return fileTime / 10000L - 11644473600000L;
    return DateTimeOffset.FromFileTime(fileTime).ToUnixTimeSeconds();

// The GeneralizedTime follows ASN.1 format, something like: 20190903130100.0Z and 20190903160100.0+0300
private static long GeneralizedTimeToUnixTimestamp(string generalizedTime)
    var formats = new string[] { "yyyyMMddHHmmss.fZ", "yyyyMMddHHmmss.fzzz" };
    return DateTimeOffset.ParseExact(generalizedTime, formats, System.Globalization.CultureInfo.InvariantCulture).ToUnixTimeSeconds();

Ldap search filter date time, Convert 18-digit LDAP/FILETIME timestamps to human-readable date. The 18-​digit Active Directory timestamps, also named 'Windows NT time format', 'Win32  The two attributes that hold this information are whenCreated and whenChanged, and they are present on all AD objects. You use these two attributes like any other in you LDAP queries, the only thing to watch is the syntax of the date/time value.

Ldap Convert, 000 will be converted to this. ldapsearch is a shell-accessible interface to the 2011, Aug 25, 12:00:01 Jan 13, 2017 · First we need a function to convert DateTime to The attribute 'whenChanged' is a Generalized-Time string - so it must be in LDAP filter that is understood by an Please provide filter condition or C# code  WhenChanged is a date time attribute which holds an AD object’s latest changed time and it is Non-Replicable attribute. uSNChanged is a integer attribute and it will be updated when the object is changed. Both are Non-Replicable attributes but that doesn’t mean every domain controller holds very different value like lastLogon attrbute. Yes

Converting the WhenChanged attribute (Generalized-Time) in LDAP to a DateTime in C#. I recently switch from using S.DS namespace (which uses ADSI) to the  The two elements are memberOf and member can themselves contain multiple values (they're "multi-valued" attributes in AD) - so you'll need a list of strings for these:

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