3 calls to system_date_format_save()

DateTimeFunctionalTest::testDateFormatStorage in modules/system/system.test: Test if the date formats are stored properly.
system_add_date_formats_form_submit in modules/system/system.admin.inc: Process new date format string submission.
system_date_formats_rebuild in modules/system/system.module: Resets the database cache of date formats and saves all new date formats.

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