The 48x48 Free Time Icons pack offers comprehensive icons for software applications and websites. Everything required is available in this pack.

But there's an exception to this rule, and it's the 48x48 Free Time Icons set developed by StandardIcons. With this set, you can instantly improve your application and add a touch of professionalism that was previously difficult to attain.
The set provides icon images in 48x48 size only but with two color schemes, 256 and 32-bit color. The available file formats include PNG, BMP, GIF, and ICO. The icons are available for immediate free download, and you can also find bigger icon sets with sizes of up to 256x256 pixels and source files on StandardIcons.com.
Overall, if you're looking to add a professional touch to your application, the 48x48 Free Time Icons set is a great investment, especially considering they're available for free.
Version 2013.1: 6 icons have been updated.