Difference between revisions of "Manipulating Dates"

Revision as of 15:43, 27 July 2011

The following JavaScript functions are built-in to SmartSimple to assist when working with and performing calculations using dates:

ConvertDateStr

Takes a date that is in the users preferred display format and returns the date in the standard database format of yyyy-mm-dd.

Syntax:

ConvertDateStr(date,'@dateformat@')

Where:

• date is the date you wish to change to the yyyy-mm-dd' format.

Example:

var newDate=ConvertDateStr(frm.startdate.value,'@dateformat@');

ConvertDate

Takes a date that is in the standard database format of yyyy-mm-dd and converts it to the preferred display format of the current user.

Syntax:

ConvertDate(date,'@dateformat@')

Where:

• date is the date you wish to change to the users preferred display format.

Example:

var newDate=ConvertDate(sdate,'@dateformat@');

ssConvertDate

Takes a date in any date format and converts it to any other date format.

Syntax:

ConvertDate(date,'fromdateformat','todateformat')

Where:

• date is the date you wish to change to the users preferred display format.
• fromdateformat is the format of the date you are providing
• todateformat is the format you want the resulting date to use.

Example:

var newDate=ssConvertDate(sdate,'yyyy-mm-dd','dd/mm/yyyy');

or

var newDate=ssConvertDate(sdate,'mm/dd/yyyy','dd-mm-yyyy');

dateadd

Add the specified interval to a date

Syntax:

dateadd(date,unit,interval)

Where:

• date is the date you wish to add to (or delete from) in format yyyy-mm-dd
• unit specifies what is being added:

• 'd' (days)
• 'm' (months)
• 'y' (years)

• interval is the number of days/months/years to be added.

Example:

var newDate=dateadd(sdate,'m',duration);

Example

The following example adds a specified number of months (saved in cf_123456) to the startdate, and saves it as the enddate.

var sdate=ConvertDateStr(frm.startdate.value,'@dateformat@');
var duration=parseInt(parseFloat(frm.cf_123456.value));
if(isNaN(duration)){
   alert("Invalid Duration provided");
   return;
   }
var edate=dateadd(sdate,'m',duration);
frm.enddate.value=ssConvertDate(edate,"@dateformat@");

Notes

• When using JavaScript to populate a date it must be added to the field in the preferred date format of the current user, as the system will automatically convert it to yyyy-mm-dd when the page is saved.

See Also

• busdateadd
• isHoliday
• Custom Defined Holidays