https://blog.csdn.net/chuhe163/article/details/87194832
当天日期
${__time(YMD)}
昨天日期
${_intSum(${__time(YMD)},-1)}
当月月份
${__time(M)}
上月月份
${_intSum(${__time(M)},-1)}
下月月份
${_intSum(${__time(M)},1)}