Current timestamp as filename in Java

Question

I want to name new files created by my Java application with the current timestamp   I need help with this  How do I name the new files created with the current timestamp  Which classes should I include

User · Answer

You can get the current timestamp appended with a file extension in the following way   String fileName   new Date   getTime       txt

User · Answer

You can use DateTime   import org joda time DateTime   Option 1   with yyyyMMddHHmmss  DateTime now   toString  yyyyMMddHHmmss     Will give 20190205214430  Option 2   yyyy-dd-M--HH-mm-ss     DateTime now   toString  yyyy-dd-M--HH-mm-ss     will give 2019-05-2--21-43-32

User · Answer

Use SimpleDateFormat as aix suggested to format the current time into a string  You should use a format that does not include   characters etc  I would suggest something like yyyyMMddhhmm

User · Answer

try this one  String fileSuffix   new SimpleDateFormat  yyyyMMddHHmmss   format new Date

User · Answer

No need to get too complicated  try this one liner   String fileName   new SimpleDateFormat  yyyyMMddHHmm  txt    format new Date

User · Answer

Improving the  Derek Springer post with fill length function  public static String getFileWithDate String fileName  String fileSaperator  String dateFormat        String FileNamePrefix   fileName substring 0  fileName lastIndexOf fileSaperator        String FileNameSuffix   fileName substring fileName lastIndexOf fileSaperator  1  fileName length           System out println  quot File  Prefix Suffix  quot  FileNamePrefix   quot   quot  FileNameSuffix            String newFileName   new SimpleDateFormat  quot   quot  FileNamePrefix  quot    quot  dateFormat  quot   quot  fileSaperator FileNameSuffix  quot   quot   format new Date         System out println  quot New File  quot  newFileName       return newFileName     Using the funciton and its Output  String fileSaperator    quot   quot   format    quot yyyyMMMdd HHmm quot   getFileWithDate  quot Text1 txt quot   fileSaperator  format   getFileWithDate  quot Text1 doc quot   fileSaperator  format   getFileWithDate  quot Text1 txt json quot   fileSaperator  format    Output  Old File Text1 txt   New File Text1 2020Nov11 1807 txt Old File Text1 doc   New File Text1 2020Nov11 1807 doc Old File Text1 txt json  New File Text1 txt 2020Nov11 1807 json

User · Answer

Date  SimpleDateFormat and whatever classes are required on the I O side of things  there are many possibilities

[java] Current timestamp as filename in Java

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