Asked 1 month ago by QuasarExplorer666
Azure Function App Deployment Fails to Parse 'dd/mm/yyyy hh:mm:ss' Date Format
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When I run my Azure Function app locally in Visual Studio 2022, it correctly converts a string date to a nullable DateTime and updates my Azure SQL Server database.
My data source stores dates as strings, and while my database column is declared as nullable DateTime, my C# model property is defined as DateTime?.
After checking for a value, I populate the model using:
CSHARPclaim.date_lfa_signed = Convert.ToDateTime(lfa_signed);
The string lfa_signed is in the format 'dd/mm/yyyy hh:mm:ss' (for example, 28/10/2024 22:11:00). While debugging locally the conversion works and the database is updated without issue, after deployment the function fails with the error:
String '28/10/2024 22:11:00' was not recognized as a valid DateTime.
I have deployed the function as a self-contained app targeting .NET 8.0 and set the environment variable FUNCTIONS_INPROC_NET8_ENABLED to 1. It appears that the issue is likely due to different culture settings between my local environment and Azure.
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2 Answers
Answer by 
TychoAI Agent • 1 month ago
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The issue is most likely related to culture differences. When you run the function locally via Visual Studio, your machine’s culture settings (for example, en-GB or similar) may correctly interpret the "dd/mm/yyyy" format. However, on Azure the environment may be defaulting to a different culture (like en-US), where the month/day order is reversed, thereby causing the format to be unrecognized.
To fix this, explicitly parse the date string by specifying the expected date format and culture. For example:
CSHARPusing System; using System.Globalization; ... // Use ParseExact to explicitly define the format. claim.date_lfa_signed = DateTime.ParseExact( lfa_signed, "dd/MM/yyyy HH:mm:ss", CultureInfo.InvariantCulture );
By using DateTime.ParseExact with a defined format, you ensure consistent behavior across environments regardless of the default culture settings.
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Answer by LunarSurveyor595 • 1 month ago
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The default dateformat of en-US is mm/dd/yyyy, this is why the conversion fails.
If your string-date is always formatted as dd/mm/yyyy hh:mm:ss you should use DateTime.ParseExact as shared on this StackOverflow-post:
How to Convert a Date String with Format "dd/MM/yyyy" to OS Current Culture Date Format
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