Function day() extracts the day of a time value and returns that integer.
Arguments：
- Time <datetime | timestamp | string>
Returns：
- Day <number>
Constant
Example: return the day of "2020-01-02 00:05:32"
return day("2020-01-02 00:05:32")
Function
Example: return the day of current system time
return day(now())
Alias
Example: find 10 cards, return their open days
return day(now())
Property
Example: find 10 cards that were opened on 5th in random months
find().nodes({day(@card.open_date) == 5}) as n
limit 10
return n{*}