"IntlDateFormatter" function

[MohammaddReza]

As you know from php 5.3 and upper,we can use the "IntlDateFormatter" function.
how we can change the whole system calendar by using this following sample code?

$fmt = new IntlDateFormatter("fa_IR@calendar=persian", IntlDateFormatter::FULL,
IntlDateFormatter::FULL, 'Asia/Tehran', IntlDateFormatter::TRADITIONAL);

[anselmdk]

Good idea.
I actually had similar considerations when writing the importer, as I wanted it to support importing both European and US dates. See 85ec4b8#diff-a53ca3901ccb7247b6f0a27d5adad491R11

Using that format they should be configurable through the config.yml file. We could achieve something similar by allowing for a setting on the calendar config: https://github.com/titledk/silverstripe-calendar/blob/master/code/core/CalendarConfig.php#L30 (which not yet is configurable through yml...)

Then only the methods presenting the strings would have to be amended using IntlDateFormatter for presentation. Under the hood we should stick to the format dates are stored in in MySQL.