kyle
/
goutils
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
goutils/cmd/utc/README

92 lines
3.4 KiB
Plaintext
Raw Normal View History

Add utc for time -> UTC conversions.
2016-06-14 21:55:04 +00:00
utc: convert times to UTC
Improved time zone check. 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.
2016-06-14 23:42:33 +00:00
Usage: utc [-f format] [-h] [-o format] [-q] [-u] [-z zone] [time(s)...]
Updating docs, add a few new features to utc.
2016-06-14 22:22:38 +00:00
Add utc for time -> UTC conversions.
2016-06-14 21:55:04 +00:00
utc converts times to UTC. If no arguments are provided, prints the
Improved time zone check. 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.
2016-06-14 23:42:33 +00:00
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.
Add utc for time -> UTC conversions.
2016-06-14 21:55:04 +00:00
Flags:
Updating docs, add a few new features to utc.
2016-06-14 22:22:38 +00:00
-f format Go timestamp format for input times. See the Go docs
Add utc for time -> UTC conversions.
2016-06-14 21:55:04 +00:00
(e.g. https://golang.org/pkg/time/#pkg-constants)
for an explanation of this format.
Updating docs, add a few new features to utc.
2016-06-14 22:22:38 +00:00
Default value: 2006-01-02 15:04
Improved time zone check. 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.
2016-06-14 23:42:33 +00:00
-h Print this help message.
Updating docs, add a few new features to utc.
2016-06-14 22:22:38 +00:00
-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.
Improved time zone check. 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.
2016-06-14 23:42:33 +00:00
-q Suppress the timezone check warning message.
Updating docs, add a few new features to utc.
2016-06-14 22:22:38 +00:00
-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.
Add utc for time -> UTC conversions.
2016-06-14 21:55:04 +00:00
-z zone Text form of the time zone; this can be in short
time zone abbreviation (e.g. MST) or a location
Updating docs, add a few new features to utc.
2016-06-14 22:22:38 +00:00
(e.g. America/Los_Angeles). This has no effect when
printing the current time.
Default value: Local
Add utc for time -> UTC conversions.
2016-06-14 21:55:04 +00:00
Examples (note that the examples are done in the America/Los_Angeles /
PST8PDT time zone):
+ Getting the current time in UTC:
$ utc
2016-06-14 14:30 = 2016-06-14 21:30
+ Converting a local timestamp to UTC:
$ utc '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-15 04:30
+ Converting a local EST timestamp to UTC (on a machine set to
PST8PDT):
$ utc -z EST '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-15 02:30
+ Converting timestamps in the form '14-06-2016 3:04PM':
$ utc -f '02-01-2006 3:04PM' '14-06-2016 9:30PM'
14-06-2016 9:30PM = 15-06-2016 4:30AM
+ Converting timestamps from standard input:
$ printf "2016-06-14 14:42\n2016-06-13 11:01" | utc -
2016-06-14 14:42 = 2016-06-14 21:42
2016-06-13 11:01 = 2016-06-13 18:01
+ Converting a UTC timestamp to the local time zone:
$ utc -u '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-14 14:30
+ Converting a UTC timestamp to EST (on a machine set to
PST8PDT):
$ utc -u -z EST '2016-06-14 21:30'
2016-06-14 21:30 = 2016-06-14 16:30
Updating docs, add a few new features to utc.
2016-06-14 22:22:38 +00:00
+ 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
Improved time zone check. 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.
2016-06-14 23:42:33 +00:00
+ 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