# Create monthly indexes based on event attribute
**URL:** https://discuss.elastic.co/t/create-monthly-indexes-based-on-event-attribute/29372
**Category:** Logstash
**Created:** [September 16, 2015, 8:23am UTC](https://discuss.elastic.co/t/create-monthly-indexes-based-on-event-attribute/29372 "2015-09-16T08:23:40Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@karasmeitar](https://discuss.elastic.co/u/karasmeitar)
#### Post date: [September 16, 2015, 8:23am UTC](https://discuss.elastic.co/t/create-monthly-indexes-based-on-event-attribute/29372/1 "2015-09-16T08:23:40Z")
Hi All,
can i perform JODA functions in the output section on other attributes then timestamp(%{+YYYY.MM})?
i need to create indexes base on couple of attributes in my event and i can't use only the timestamp.
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [September 16, 2015, 8:31am UTC](https://discuss.elastic.co/t/create-monthly-indexes-based-on-event-attribute/29372/2 "2015-09-16T08:31:07Z")
What do you want to use?
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### Author:  [@karasmeitar](https://discuss.elastic.co/u/karasmeitar)
#### Post date: [September 16, 2015, 9:31am UTC](https://discuss.elastic.co/t/create-monthly-indexes-based-on-event-attribute/29372/3 "2015-09-16T09:31:43Z")
i have 2 dates attributes in the event:
date {
match =\> ["install\_date", "UNIX\_MS"]
target=\> "install\_date\_index\_time"
}
date{
match =\> ["calendar\_date","UNIX\_MS"]
target =\> "calendar\_date\_index\_time"
I want to insert the event to index name calendar\_date\_index\_time{YYYY.MM} and install\_date\_index\_time.YYYY.MM
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 5:29am UTC](https://discuss.elastic.co/t/create-monthly-indexes-based-on-event-attribute/29372/4 "2017-07-06T05:29:01Z")