Description
Period defines reindex period.
The time parameter understands this format:
xxxA[yyyB[zzzC]]
where
xxx,
yyy,
zzz
are numbers (negative numbers are allowed), and
A,
B,
C
are
interval specifier characters as follows:
s - second
M - minute
h - hour
d - day
m - month
y - year
Note:
The specifier characters are similar to format characters
used by the strptime and strftime
C functions.
If the time value is put into single or double quotes,
spaces are allowed between xxx, A and
yyy, and so on.
If you specify only a number without any characters, it is assumed
that time is given in seconds.
The default value is 7d (one week).