Suggestion: Give us option to change format from [Jul '17] to something else, like [6/10/2017-7/9/2017]

[hub2git]

Dear dev,

My vnstat report looks like this:

root@LEDE:~# vnstat 

                      rx      /      tx      /     total    /   estimated
 wlan1:
       Jul '17     57.83 MiB  /  497.46 MiB  /  555.29 MiB
       Aug '17     50.55 MiB  /  369.29 MiB  /  419.84 MiB  /  540.00 MiB
     yesterday         0 KiB  /    2.49 MiB  /    2.49 MiB
         today         0 KiB  /      44 KiB  /      44 KiB  /      --    

 wlan0:
       Jul '17    186.26 MiB  /    1.31 GiB  /    1.49 GiB
       Aug '17    536.69 MiB  /    3.82 GiB  /    4.34 GiB  /    5.60 GiB
     yesterday     39.56 MiB  /  290.88 MiB  /  330.45 MiB
         today      1.94 MiB  /    3.10 MiB  /    5.03 MiB  /     197 MiB

I sometimes find myself looking at the monthly report and seeing something like Jul '17 and wondering, Hmmm... is that
A) the July 10 to August 9 cycle
or
B) the June 10 to July 9 cycle?

Might I suggest giving us the option of renaming them?
Some possible formats:
(Words) July 10, 2017 -- Aug. 9, 2017
or
(Pure numbers) 06/10 - 07/09/2017.

[vergoh]

You could achieve something close to that by kind of cheating a little bit. It's possible to modify MonthFormat in the configuration file to contain hardcoded characters like the "10" in your case. However, getting the end of the cycle would be a little bit trickier as even the database doesn't really have that information available.

[tolysz]

On that note could we have an option to show dates in "ISO 8601" format?

[vergoh]

The ISO 8601 format is the default starting from b6aaf0b.