Updating docs, add a few new features to utc.

This commit is contained in:
Kyle Isom 2016-06-14 15:22:38 -07:00
parent a0e48cd55b
commit 57e31bfcf4
2 changed files with 42 additions and 15 deletions

View File

@ -1,18 +1,35 @@
utc: convert times to UTC
Usage: utc [-f format] [-u] [-h] [-z zone] [time(s)...]
utc converts times to UTC. If no arguments are provided, prints the
current time in UTC. If the only time provided is "-", reads
newline-separated timestamps from standard input.
current time in UTC.
Flags:
-f format Go timezone format. See the Go documentation
-f format Go timestamp format for input times. See the Go docs
(e.g. https://golang.org/pkg/time/#pkg-constants)
for an explanation of this format.
Default value: 2006-01-02 15:04
-h Print a help message.
-o format Go timestamp format for outputting times. Uses the
same format as the '-f' argument; it defaults to
the same value as the '-f' argument.
-u Timestamps are in UTC format and should be converted
to the timezone specified by the -z argument (which
defaults to 'Local'). Note that this isn't particularly
useful with no arguments.
-z zone Text form of the time zone; this can be in short
time zone abbreviation (e.g. MST) or a location
(e.g. America/Los_Angeles). This has no effect
when printing the current time.
(e.g. America/Los_Angeles). This has no effect when
printing the current time.
Default value: Local
Examples (note that the examples are done in the America/Los_Angeles /
PST8PDT time zone):
@ -41,8 +58,9 @@ PST8PDT time zone):
PST8PDT):
$ utc -u -z EST '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-14 16:30
+ Using a different output format:
$ utc -o '2006-01-02T15:03:04MST' '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-15T04:04:30UTC

View File

@ -11,6 +11,7 @@ import (
var (
format = "2006-01-02 15:04" // Format that will be used for times.
outFormat = format // Output format.
tz = "Local" // String descriptor for timezone.
fromLoc *time.Location // Go time.Location for the named timezone.
toLoc *time.Location // Go time.Location for output timezone.
@ -20,11 +21,12 @@ func usage(w io.Writer) {
fmt.Fprintf(w, `Usage: utc [-f format] [-u] [-h] [-z zone] [time(s)...]
utc converts times to UTC. If no arguments are provided, prints the
current time in UTC.
current time in UTC. If the only time provided is "-", reads newline-
separated timestamps from standard input.
Flags:
-f format Go timezone format. See the Go documentation
-f format Go timestamp format for input times. See the Go docs
(e.g. https://golang.org/pkg/time/#pkg-constants)
for an explanation of this format.
@ -32,6 +34,10 @@ Flags:
-h Print this help message.
-o format Go timestamp format for outputting times. Uses the
same format as the '-f' argument; it defaults to
the same value as the '-f' argument.
-u Timestamps are in UTC format and should be converted
to the timezone specified by the -z argument (which
defaults to '%s'). Note that this isn't particularly
@ -71,7 +77,9 @@ PST8PDT time zone):
PST8PDT):
$ utc -u -z EST '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-14 16:30
+ Using a different output format:
$ utc -o '2006-01-02T15:03:04MST' '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-15T04:04:30UTC
`, format, tz, tz)
}
@ -82,6 +90,7 @@ func init() {
flag.Usage = func() { usage(os.Stderr) }
flag.StringVar(&format, "f", format, "time format")
flag.BoolVar(&help, "h", false, "print usage information")
flag.StringVar(&outFormat, "o", outFormat, "output time format")
flag.BoolVar(&utc, "u", false, "timestamps are in UTC format")
flag.StringVar(&tz, "z", tz, "time zone to convert from; if blank, the local timezone is used")
@ -114,7 +123,7 @@ func init() {
}
func showTime(t time.Time) {
fmt.Printf("%s = %s\n", t.Format(format), t.In(toLoc).Format(format))
fmt.Printf("%s = %s\n", t.Format(format), t.In(toLoc).Format(outFormat))
}
func dumpTimes(times []string) bool {