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Home/ Questions/Q 54369
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Asked: May 10, 20262026-05-10T17:12:33+00:00 2026-05-10T17:12:33+00:00

I have limited experience with .net. My app throws an error this.dateTimeFormat is undefined

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I have limited experience with .net. My app throws an error this.dateTimeFormat is undefined which I tracked down to a known ajax bug. The workaround posted said to:

‘Register the following as a startup script:’

Sys.CultureInfo.prototype._getAbbrMonthIndex = function(value) { if (!this._upperAbbrMonths) { this._upperAbbrMonths = this._toUpperArray(this.dateTimeFormat.AbbreviatedMonthNames); } return Array.indexOf(this._upperAbbrMonths, this._toUpper(value)); }; 

So how do I do this? Do I add the script to the bottom of my aspx file?

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  1. 2026-05-10T17:12:34+00:00Added an answer on May 10, 2026 at 5:12 pm

    You would use ClientScriptManager.RegisterStartupScript()

    string str = @'Sys.CultureInfo.prototype._getAbbrMonthIndex = function(value) {      if (!this._upperAbbrMonths) {          this._upperAbbrMonths = this._toUpperArray(this.dateTimeFormat.AbbreviatedMonthNames);     }     return Array.indexOf(this._upperAbbrMonths, this._toUpper(value));  };';  if(!ClientScriptManager.IsStartupScriptRegistered('MyScript'){   ClientScriptManager.RegisterStartupScript(this.GetType(), 'MyScript', str, true) } 
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