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日期表达式用法举例：
| Relative range example | From | Until |
|---|---|---|
| Last 5 minutes | now-5m | now |
| So far today | now/d | now |
| This week | now/w | now/w |
| Last week | now-1w/w | now-1w/w |
| So far this week | now/w | now |
| Current month | now/M | now/M |
| Last month | now-1M/M | now-1M/M |
| This month to date | now/M | now |
| So far this year | now/Y | now |
| This year | now/Y | now/Y |
| Last year | now-1y/y | now-1y/y |
| The last 13 months | now-13M/M | now-1M/end |
| From 00:00 on the day of last month to the end of last month | now-1M/d | now-1M/d |
注：now是指cube的更新时间：
