Use case
Create a calculated number field that displays the elapsed time in months since a date selected in a Date Picker field.
⚒️ Configuration
Create a new Calculated Number Field (by JWT) custom field and name it properly.
Providing a description will help you to identify what the custom field does but this step is optional.
Parser expression
Add the following parser expression:
Bash
{issue.cfaaaaa} != null ? ((year({system.currentDateTime}, LOCAL) - year({issue.cfaaaaa}, LOCAL))*12 + month({system.currentDateTime}, LOCAL) - (month({issue.cfaaaaa}, LOCAL))) : null
Do not forget to replace {issue.cfaaaaa} with the field codes of your Date Picker field.
Display format
Content type
Choose Duration
Duration display format
The display format is Number with the following custom format.
Bash
## month(s)
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