See Joel Program

August 7, 2008

Supported Number and DateTime Format Strings in ASP.NET AJAX

Filed under: ASP.NET AJAX — Joel Rumerman @ 11:41 am
We all make mistakes, some are just published in books.

Consider this my first correction to Adam’s and my book: Advanced ASP.NET AJAX Server Controls for .NET 3.5.

In Chapter 6: ASP.NET AJAX Localization, on page 289, we have a tip on Data Format Strings. It states that “the data format strings available for the Date and Number types in JavaScript are the same as those that are available in .NET for the DateTime and Double types.” This is incorrect.
The format strings that are allowed for Number types are the following:

  • c or C: Currency
  • p or P: Percentage
  • d or D“: Decimal (# number of digits)
  • n or N“: Numeric (# number of digits after decimal)

– e, f, g, r, x, and custom format strings are not supported

The standard format strings that are allowed for the Date type are the following:
  • d: Short date pattern
  • D: Long date pattern
  • t: Short time pattern
  • T: Long time pattern
  • F: Full date/time pattern (long time)
  • m or M: Month day pattern
  • s: Sortable date/time pattern
  • y or Y: Year month pattern
– the standard format strings: f, F, g, G, O, o, R, r, u, U are not supported. However, custom format strings that use the “mmm”, “yyyy”, “hh”, etc. formats are supported. You can build your own date format string.

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