获取过去某个时刻时间戳

i1.'最近一小时

bTime = (new Date(moment().subtract(1, "hours").format('YYYY-MM-DD hh:mm:ss ')).getTime())/1000

2.最近一天

bTime = (new Date(moment().subtract(24, "hours").format('YYYY-MM-DD hh:mm:ss ')).getTime())/1000

3.最近一周

bTime = (new Date(moment().subtract(168, "hours").format('YYYY-MM-DD hh:mm:ss ')).getTime())/1000