Absolute time parsing does not work

[andrewpage]

I noticed this issue when the following command wasn't returning any log events locally:

$ saw get /Production/Gateway/Rails --start "2018-12-10"                                                                               130 ↵

I dug into the config/configuration.go getTime() func, which looks like its using time.Parse with the time.RFC3339 format for absolute time values for both start and end timestamps. I plugged similar code into the Go playground, and it looks like this parse format does not support shorthand dates, like were shown in the README example, such as "2018-06-26".

package main

import (
	"fmt"
	"time"
)

func main() {
	timeStr := "2018-06-26"
	time, err := time.Parse(time.RFC3339, timeStr)
	
	if(err == nil) {
		fmt.Printf("We have the time %s", time.Local())
	} else {
		fmt.Printf("Error: %s", err);
	}
}

Error: parsing time "2018-06-26" as "2006-01-02T15:04:05Z07:00": cannot parse "" as "T"

[andrewpage]

Just saw that someone else reported a similar issue. Didn't notice it since the issue name wasn't descriptive.

I'm not a Go pro but I can take a crack at fixing this. Are you open to accepting PRs? Perhaps we could support a number of different formats and iterate through them until we find a match? If not, then throw the error.