jsDate

VBScript native Date functions emulated in Javascript

About

As a scripting language, Javascript is extremely powerful, yet it is pitifully weak with dates and times.  Several types of date/time operations are very difficult to accomplish (and accurately) in Javascript.  VBScript is comparatively very strong in that area, though, possessing several date/time functions, like isDate(), dateAdd(), dateDiff(), datePart(), weekdayName() and monthName().  I've re-created and packaged those functions for Javascript in an include file, called jsDate.  Check it out...

Demo

Source (right-click and save)

notes

• isDate(), dateAdd(), dateDiff() are the biggest helps for Javascript.  The others are just icing.
• Compatibility: the functions should work in any modern browser.  The demo itself works in IE and Firefox at least.
• Usage: copy the file to your project, link to it, and you can begin using the functions just as would in VBScript.
• Limitations: in VBScript, DateDiff() and DatePart() accept the option arguments firstdayofweek and firstweekofyear.  jsDate ignores those arguments, and assumes Sunday and the week of January 1st (which is default in VBScript).
• Enhancements: VBScript is not capable of dealing with Milliseconds.  Javascript can, though, so I enabled that extended interval for jsDate's dateAdd() and dateDiff() functions. 
• Other differences: jsDate's isDate() is less strict than VBScript's, and may let otherwise invalid dates through (this is because Javascript internally "corrects" the date, e.g. 1/32/2000 --> 2/1/2000).
• TODO: FormatDateTime() (anyone have a good object-based one to contribute?); ~isDate2() - strict like VBScript

history

• 2005-08-03 - v0.93b: fixed dateDiff/leapyear bug with yyyy/m/q intervals (thanks Rolando and Dr. John for catching this);  updated this demo's DOM scripting
• 2004-11-26 - v0.91: fixed datePart/ww bug, added weekdayName() & monthName(), first published
• 2004-08-30 - v0.9: brand new

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credits/author

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