- 何秒時間がかかったか計算
$ echo $(expr `date -d"10:46:00" +%s` - `date -d"10:41:10" +%s`)
290
- 日付指定
$ echo $(expr `date -d"2018-07-11 10:46:00" +%s` - `date -d"2018-07-10 10:41:10" +%s`)
86690
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