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DateConvertISO8601(ISO8601dateString, targetZoneOffset)

Last updated September 28, 2004

author

David Satz

Version: 1 | Requires: CF5 | Library: DateLib

Description:
This function take a string that holds a date in ISO 8601 and converts it to ODBC datetime, but could be adapted to convert to whatever you like. It also will convert to a datetime in a timezone of your choice by specifying the offset, i.e. it could take a datetime in GMT and convert to PT. See http://www.w3.org/TR/NOTE-datetime for description of ISO 8601, the International Standard for the representation of dates and times.

Return Values:
Returns a datetime.

Example:

<cfscript>
	dt = "2004-09-23T09:12:00-07:00";
	PSTtargetZoneOffset = -8;
	ESTtargetZoneOffset = -5;
	GMTtargetZoneOffset = 0;

	TimeZoneInfo = GetTimeZoneInfo();
	if ( TimeZoneInfo.isDSTOn ) {
		PSTtargetZoneOffset = PSTtargetZoneOffset  + 1;
		ESTtargetZoneOffset = ESTtargetZoneOffset  + 1;
	}
</cfscript>
<cfoutput>
	<h2>isDSTOn: #TimeZoneInfo.isDSTOn#</h2>
	<hr>
	<b>#variables.dt#</b><br>
	Formatted with CreateODBCDateTime: #CreateODBCDateTime( left(variables.dt,10) & " " & mid(variables.dt,12,8))#<br>
	<!--- String: #(left(variables.dt,10) & " " &  mid(variables.dt,12,8))#<br>
	DateConvert: #DateConvert("utc2Local", left(variables.dt,10) & " " & mid(variables.dt,12,8))#<br> --->
	DateConvertISO8601 PST: #DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset),"hh:mm:ss tt")#<br>
	DateConvertISO8601 EST: #DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset),"hh:mm:ss tt")#<br>
	DateConvertISO8601 UTC: #DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset),"hh:mm:ss tt")#
</cfoutput>
<hr>
<cfset dt = "2004-09-23T09:12:00+07:00">
<cfoutput>
	<b>#variables.dt#</b><br>
	Formatted with CreateODBCDateTime: #CreateODBCDateTime( left(variables.dt,10) & " " & mid(variables.dt,12,8))#<br>
	<!--- String: #(left(variables.dt,10) & " " &  mid(variables.dt,12,8))#<br>
	DateConvert: #DateConvert("utc2Local", left(variables.dt,10) & " " & mid(variables.dt,12,8))#<br> --->
	DateConvertISO8601 PST: #DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset),"hh:mm:ss tt")#<br>
	DateConvertISO8601 EST: #DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset),"hh:mm:ss tt")#<br>
	DateConvertISO8601 UTC: #DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset),"hh:mm:ss tt")#
</cfoutput>
<hr>
<cfset dt = "2004-09-23T09:12:00Z">
<cfoutput>
	<b>#variables.dt#</b><br>
	Formatted with CreateODBCDateTime: #CreateODBCDateTime( left(variables.dt,10) & " " & mid(variables.dt,12,8))#<br>
	<!--- String: #(left(variables.dt,10) & " " &  mid(variables.dt,12,8))#<br>
	DateConvert: #DateConvert("utc2Local", left(variables.dt,10) & " " & mid(variables.dt,12,8))#<br> --->
	DateConvertISO8601 PST: #DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.PSTtargetZoneOffset),"hh:mm:ss tt")#<br>
	DateConvertISO8601 EST: #DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.ESTtargetZoneOffset),"hh:mm:ss tt")#<br>
	DateConvertISO8601 UTC: #DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset)# : #DateFormat(DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset),"mmm dd, yyyy")# #TimeFormat(DateConvertISO8601(variables.dt,variables.GMTtargetZoneOffset),"hh:mm:ss tt")#
</cfoutput>

Parameters:

Name Description Required
ISO8601dateString The ISO8601 date string. Yes
targetZoneOffset The timezone offset. Yes

Full UDF Source:

/**
 * Convert a date in ISO 8601 format to an ODBC datetime.
 * 
 * @param ISO8601dateString 	 The ISO8601 date string. (Required)
 * @param targetZoneOffset 	 The timezone offset. (Required)
 * @return Returns a datetime. 
 * @author David Satz (david_satz@hyperion.com) 
 * @version 1, September 28, 2004 
 */
function DateConvertISO8601(ISO8601dateString, targetZoneOffset) {
	var rawDatetime = left(ISO8601dateString,10) & " " & mid(ISO8601dateString,12,8);
	
	// adjust offset based on offset given in date string
	if (uCase(mid(ISO8601dateString,20,1)) neq "Z")
		targetZoneOffset = targetZoneOffset -  val(mid(ISO8601dateString,20,3)) ;
	
	return DateAdd("h", targetZoneOffset, CreateODBCDateTime(rawDatetime));

}
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