How to compare date in C# and SQL getdate() function

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Hi,
I have a date column in sql server which shows date as
'2022-09-11 10:12:48.830'

i have to find whether date is older than 24 hours in C# dotnet core.

I tried below code , but it gives error-
formatexception: string '2022-18-11 11:18:04:nnn' was not recognized as a valid datetime.

What I have tried:

string dt = DateTime.Now.ToString("yyyy-mm-dd hh:mm:ss:nnn", CultureInfo.InvariantCulture);

c.CreateDatetime < Convert.ToDateTime(dt, CultureInfo.InvariantCulture).AddHours(-24)

Posted 11-Sep-22 7:56am

lalit.mca2006

Updated 11-Sep-22 8:22am

v6

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OriginalGriff · Accepted Answer · 2022-09-11T08:22:00

Don't convert dates to strings in order to convert them: convert strings to DateTime and compare those.
Equally, if it's a DATETIME, DATETIME2 or DATE column in SQL, then it automatically converts to a DateTime in C# (as it's stored in both as a number of ticks since a defined point in time).

Your code is failing because you are converting a DateTime to a string, and getting it wrong:

DateTime.Now.ToString("yyyy-mm-dd hh:mm:ss:nnn", CultureInfo.InvariantCulture)
                            ^
                            |

The format code "mm" is the minutes, not the month: Formatting a DateTime for display - format string description[^]