字符串轉換爲日期Dataweave

Question

我輸入出生列的日期.csv格式文件，其中包含字符串，例如

Aug-03-2015 

我想這個coloumn更改爲日期（如果不可能，那麼至少到另一個字符串）格式如下

03-08-2015 

。 試用了RyanCarter建議的邏輯。我現在嘗試使用

Birthday:$.DOB as :date {format : "MMM-dd-yyyy"} as :string {format: "dd/MM/yyyy"} 

其中DOB是.csv輸入中的字符串列。但我得到了下面的例外。

Message    : Exception while executing: 
DOB:$.DOB as :date {format : "MMM-dd-yyyy"} as :string {format: "dd/MM/yyyy"} 
    ^

Cannot coerce a :string to a :date, caused by :Text 'NOV-03-1992' could not be parsed at index 0 
Type     : com.mulesoft.weave.mule.exception.WeaveExecutionException 
Code     : MULE_ERROR--2 
******************************************************************************** 

Exception stack is: 
1. Cannot coerce a :string to a :date, caused by :Text 'NOV-03-1992' could not be parsed at index 0 

(com.mulesoft.weave.model.values.coercion.exception.UnsupportedTypeCoercionException) 

com.mulesoft.weave.model.values.coercion.LocalDateTypeCoercionValue:30 (null) 
2. Exception while executing: 
DOB:$.DOB as :date {format : "MMM-dd-yyyy"} as :string {format: "dd/MM/yyyy"} 
    ^
Cannot coerce a :string to a :date, caused by :Text 'NOV-03-1992' could not be parsed at index 0 (com.mulesoft.weave.mule.exception.WeaveExecutionException) 

com.mulesoft.weave.mule.WeaveMessageProcessor$WeaveOutputHandler:166 (null) 

******************************************************************************** 

Root Exception stack trace: 
com.mulesoft.weave.model.values.coercion.exception.UnsupportedTypeCoercionException: Cannot coerce a :string to a :date, caused by :Text 'NOV-03-1992' could not be parsed at index 0 

Answer 1

轉換爲日期firt使用的日期格式，然後再返回到一個字符串中使用第二日期格式：

varOutput: 'Aug-03-2015' as :date {format : "MMM-dd-yyyy"} as :string {format: "dd/MM/yyyy"}