Currently, Jira's default values for the Date/Time field formatting are as follows:

• jira.date.time.picker.java.format: dd/MMM/yy h:mm a
• jira.date.time.picker.javascript.format: %e/%b/%y %I:%M %p

However, this results in an inconsistency in how the dates Java and JavaScript dates are presented by default.

In Java, 'd' is equivalent to JavaScript's '%e' (space padding), while Java's 'dd' would be equivalent to JavaScript's '%d' (zero-padding).

Unix date format

• Linux & Unix Date Format Examples
• How To Format Date For Display or Use In a Shell Script

%FORMAT String	Description
%d	is replaced by the day of the month as a decimal number (01-31);
%e	is replaced by the day of the month as a decimal number (1-31); single digits are space-padded.

Java documentation

• Date and Time Patterns

Letter	Date or Time Component	Presentation	Examples
d	Day in month	Number	10

Number: For formatting, the number of pattern letters is the minimum number of digits, and shorter numbers are zero-padded to this amount.

The same can be seen in our own documentation, Changing the Due Date Input Format, where the compatible syntax for the '15/Oct/10 8:50 AM' format is demonstrated to be different from the default Jira values.

Preferred Date/Time	Value of the jira.date.time.picker.java.format property	Value of the jira.date.time.picker.javascript.format property
15/Oct/10 8:50 AM	dd/MMM/yy h:mm a	%d/%b/%y %l:%M %p

Suggestion

To maintain consistency in how dates are presented in Jira, the default value for the date/time field should be updated either for Java or JavaScript.

• 'jira.date.time.picker.java.format - to use space-padding:

  d/MMM/yy h:mm a

• 'jira.date.time.picker.javascript.format' - to use zero-padding:

  %d/%b/%y %l:%M %p