The Lasso 9 date type allows for the same formatting rules that Lasso 8 offers. That is, formats like
date -> format(`%d %b %Y`). Anything that contains a %.

But, it turns out that the Lasso 9 date type first translates that to the proper ICU equivalent before continuing processing the date object. Thus adding processing cycles for each call. In the above example it's translated to
date -> format(`dd MMM yyyy`).

If you have a single date on a page the speed difference is indifferent. But if you have a number of date calls, like on a list of records with date fields in them, the added processing is measurable.

debug -> timer(100, 'Lasso 8') => {
date -> format(`%d %b %Y`)
}
debug -> timer(100, 'Lasso 9') => {
date -> format(`dd MMM yyyy`)
}

->
Lasso 8 x100
micros:38907.000000
micros_average:389.070000

Lasso 9 x100
micros:15884.000000
micros_average:158.840000

Less than half the time for the pure Lasso 9 format. If you want help finding out what format rules to use you can take a look at the Lasso Reference:
http://www.lassosoft.com/lassoDocs/languageReference/obj/date/format

Or peek at the translation map used by the Lasso 9 date type:

'%%'='%', // escape
'%_'='%', // strip out this option
// dates/times
'%D'='MM/dd/yyyy',
'%Q'='yyyy-MM-dd',
'%q'='yyyyMMddHHmmss',
'%r'='hh:mm:ss a',
'%T'='HH:mm:ss',
// non-padded
'%-D'='M/d/yyyy',
'%-Q'='yyyy-M-d',
'%-r'='h:m:s a',
'%-T'='H:m:s',
// parts
'%d'='dd',
'%h'='hh',
'%H'='HH',
'%M'='mm',
'%m'='MM',
'%p'='a',
'%S'='ss',
'%w'='e',
'%W'='ww',
'%y'='yy',
'%Y'='yyyy',
'%z'='Z',
// non-padded
'%-d'='d',
'%-h'='h',
'%-H'='H',
'%-M'='m',
'%-m'='M',
'%-S'='s',
'%-w'='E',
'%-W'='w',
'%-y'='y',
// names
'%a'='EEE',
'%A'='EEEE',
'%b'='MMM',
'%B'='MMMM'


HDB
Jolle

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Sept 12-14, 2013 in Niagara Falls, Canada
http://www.lassosoft.com/LDC-niagara-falls-2013

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