In hook_install() of your module define the appropriate array (name, label, pattern, module, hidden) and add it to default date settings with: system_date_format_save($date_format)
Then add hook_uninstall() to remove the formats when the module is uninstalled.
Ah! Just as I'd imported 132 report pages.
TBH, today, I'd got to the stage where I don't want to spend much more time testing/configuring/etc plug-in(s) for a one time import. OK for a bigger...
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Never mind, I figured it out.
In hook_install() of your module define the appropriate array (name, label, pattern, module, hidden) and add it to default date settings with: system_date_format_save($date_format)
Then add hook_uninstall() to remove the formats when the module is uninstalled.
I guess, my question is answered. ;)