date strings accepted by busybox `date`

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# version ???
$ # date -d [YYYY.]MM.DD-hh:mm[:ss]
$ # date -d mmddHHMMYYYY
$ # date -d HH:MM
$ ###### samples: #######
$ # April 1st 2013, 23:59
$date -d 2013.04.01-00:00 +'%s="%Y-%m-%d %H:%M:%S"'
$date -d 040123592013 +'%s="%Y-%m-%d %H:%M:%S"'
$ # Today, 00:00
$date -d 00:00 +'%s="%Y-%m-%d %H:%M:%S"'