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# date 10 # date 10.30 # date 1710 ...
# date 201511042242
# date 041122422015 date +%T -s "11:14:00"
$ date '+%Y-%m-%d_%H-%M-%S'
$ date -v-1d '+%Y.%m.%d'
date --date "1 day ago" +%d/%m/%Y