ColdFusion的日期邏輯

Question

我不好意思地承認，我不是最偉大的，當涉及到日期和日期邏輯的ColdFusion。

<!---checks frequency for form schedule and sets datepart. RecordType_Frequency is a column in database daily, weekly, monthly etc.---> 

<CFSWITCH expression="#RecordType_Frequency#"> 
    <CFCASE value="Daily"> 
     <CFSET datepart = "d"> 
    </CFCASE> 
    <CFCASE value="Weekly"> 
     <CFSET datepart = "ww"> 
    </CFCASE> 
    <CFCASE value="Monthly"> 
     <CFSET datepart = "m"> 
    </CFCASE> 
    <CFCASE value="Quarterly"> 
     <CFSET datepart = "q"> 
    </CFCASE> 
    <CFCASE value="Yearly"> 
     <CFSET datepart = "yyyy"> 
    </CFCASE> 
</CFSWITCH> 

<!---setting dates based on database values for when the form should schedule---> 

<!---enddate Uses the RecordType_Frequency_StartDate column from the database which is a date in the past. Coefficient is a stored db value for the frequency 1,2 etc. for could scheduled every 1 year, 2 year ---> 

<cfset enddate = datediff(datepart,RecordType_Frequency_StartDate,todaydate) + Coefficient> 

<!---start date is set to current RecordType_Frequency_StartDate which is a column value from the database---> 

<cfset startdate = RecordType_Frequency_StartDate> 

<!---sets the next start date for when the for should schedule based on historic db start date---> 

<cfset new_date = dateformat(DateADD(datepart,Coefficient,startdate),'MM-DD-YYYY')> 

<cfloop from="1" to="#enddate#" index="i"> 

    <cfset new_date = dateformat(DateADD(datepart,Coefficient,startdate),'MM-DD-YYYY')> 

    <cfset startdate = new_date> 

    <cfset diff = datediff(datepart,RecordType_Frequency_StartDate,startdate)> 

    <cfif (startdate GT todaydate)> 

     <cfset next_date= startdate> 

    <cfoutput> 

    <!---I need this output to equal the next date value that would fall based on the schedule, future date. I am seeing multiple dates and need to figure out how to capture would weould truly be the next scheduled date---> 

    Next Date = #diff# - #dateformat(next_date)#<br /> 

    </cfoutput> 

</cfif> 

    </cfloop> 

總而言之，我有一個計劃表。開始/設置日期是我必須使用的唯一日期。我需要使用我擁有的信息來獲取或填充表單的下一個預定日期。顯然，接下來的創建日期，需要在未來的下降，因爲這個日期將在配合使用調度事件。

我已經發布帶有註釋的代碼和需要幫助抓住最接近的下一個邏輯日期本應屬於序列中的當前日期。

Answer 1

http://cfquickdocs.com/#DateAdd

如果你需要的是下一個可能的日期，使用DateAdd（）函數。

例如，如果你想下一個工作日使用：dateadd("w", 1, now())

Answer 2

假設我理解你的問題，那麼UDF，我寫了一段時間後可能會解決你的問題：

http://www.bryantwebconsulting.com/blog/index.cfm/2011/2/24/EnglinshFriendly-Interval-Calculation

其中對於「間隔」的說法等幾個選項，也應該接受你在你的交換機模塊使用的。