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Improved time zone check.

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Previously, the zone check compared time.Local and time.UTC. However,
when this was tested on a machine that uses UTC locally, it became
apparent that the two pointers can differ while having the same time
zone. A more useful check is to look up the offsets for the time zones
and compare those --- they'll return the same times.
This commit is contained in:
Kyle Isom
2016-06-14 16:42:33 -07:00
parent 57e31bfcf4
commit c3909b92f1
2 changed files with 100 additions and 15 deletions
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37
cmd/utc/README
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@@ -1,9 +1,13 @@
utc: convert times to UTC
Usage: utc [-f format] [-u] [-h] [-z zone] [time(s)...]
Usage: utc [-f format] [-h] [-o format] [-q] [-u] [-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. If both the input and output
timezones are the same (e.g., the local time zone is UTC), a warning
message will be printed on standard error. This can be suppressed with
the -q option.
Flags:
@@ -13,12 +17,14 @@ Flags:
Default value: 2006-01-02 15:04
-h Print a help message.
-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.
-q Suppress the timezone check warning message.
-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
@@ -61,6 +67,25 @@ PST8PDT time zone):
+ 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
+ Example of the warning message when running utc on a machine
where the local time zone is UTC:
$ utc
==================================================================
Note: both input and output timezone offsets are the same --- this
program may not do what you expect it to.
(Converting from UTC (offset +0000) to UTC (offset +0000).)
==================================================================
2016-06-14 23:44 = 2016-06-14 23:44
+ Example of the warning message when running utc on a machine
where the local time zone is GMT:
$ utc
==================================================================
Note: both input and output timezone offsets are the same --- this
program may not do what you expect it to.
(Converting from GMT (offset +0000) to UTC (offset +0000).)
==================================================================
2016-06-14 23:46 = 2016-06-14 23:46