CFLib.org – Common Function Library Project

Description:
We needed a short bit of code to give the nearest half-hour based on 15 minute intervals. This does the trick.

Return Values:
Returns a numeric value.

Example:

<cfset Minutes = Minute(Now())>

<cfoutput>
Current minutes past the hour: #Minutes#<br>
Nearest Half Hour: #GetHalfHour(minutes)#
</cfoutput>

Parameters:

Full UDF Source:

/**
 * Returns the nearest half hour based on minutes of the hour supplied to the function.
 * 
 * @param minutes      Number of minutes past the hou for which you want to calculate the nearest half hour. (Required)
 * @return Returns a numeric value. 
 * @author Jason Smith (jason@inwebsys.net) 
 * @version 1, March 10, 2003 
 */
function GetHalfHour(minutes) {
  var min_diff = abs(30 - minutes);
  var half_hour = 0;
  if (minutes lte 30) {
    if (min_diff gte 15) { half_hour = "00"; }
    else { half_hour = "30"; }
  } 
  else if (minutes gt 30) {
    if (min_diff gte 15) { half_hour = "00"; }
    else { half_hour = "30"; }
  }
  return half_hour;
}