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‎Justfile

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default:
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@just --list --unsorted
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host := `uname -a`
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# used for building pcre...
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export CC := "musl-gcc -static"
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project := "datediff"
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main_file := project + ".nim"
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main_exec := project
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musl_exec := project + "_x86_64-unknown-linux-musl"
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alias b := build
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alias s := shasum
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alias r := release
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# build main
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# Garbage Collector and Memory management https://nim-lang.org/docs/mm.html
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# --mm:markAndSweep \
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# --mm:arc \
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build:
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nim --gcc.exe:musl-gcc \
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--gcc.linkerexe:musl-gcc \
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--mm:orc \
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-d:release \
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--opt:speed \
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--passL:-static \
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--dynlibOverrideAll \
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compile {{main_file}}
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# run a specific test
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# test TEST: build
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# ./test --test {{TEST}}
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shasum:
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sha256sum {{main_exec}} >{{main_exec}}.sha256
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release tag:
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gh release create {{tag}}

‎README.md

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# datediff
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<<<<<<< HEAD
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Find differents between two dates
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=======
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Program written in Nim to find difference between `DATE1` and `DATE2`.
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Check releases with `musl`.
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## `datediff --help`
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```
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datediff - Show dates difference in specific format
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+ optionaly select a timezone with TZ environment variable
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Use tzselect(8) to find your TZ zone
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USAGE:
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datediff [options] [--] <DATE1> <DATE2>
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datediff --help
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OPTIONS:
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-f --format=FORMAT Format for date [default: yyyy-MM-dd]
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-v --verbose Show what is going on
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--help Show this help
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-s --seconds Output in: Seconds
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-m --minutes Output in: Minutes
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-h --hours Output in: Hours
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-d --days Output in: Days (This is default)
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-w --weeks Output in: Weeks
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FORMATTING:
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FORMAT is parsing DATE inputs as follows:
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d Numeric value representing the day of the month, it will be either one or two digits long.
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1/04/2012 -> 1
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21/04/2012 -> 21
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dd Same as above, but is always two digits.
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1/04/2012 -> 01
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21/04/2012 -> 21
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h The hours in one digit if possible. Ranging from 1-12.
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5pm -> 5
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2am -> 2
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hh The hours in two digits always. If the hour is one digit, 0 is prepended.
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5pm -> 05
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11am -> 11
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H The hours in one digit if possible, ranging from 0-23.
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5pm -> 17
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2am -> 2
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HH The hours in two digits always. 0 is prepended if the hour is one digit.
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5pm -> 17
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2am -> 02
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m The minutes in one digit if possible.
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5:30 -> 30
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2:01 -> 1
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mm Same as above but always two digits, 0 is prepended if the minute is one digit.
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5:30 -> 30
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2:01 -> 01
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M The month in one digit if possible.
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September -> 9
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December -> 12
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MM The month in two digits always. 0 is prepended if the month value is one digit.
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September -> 09
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December -> 12
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s Seconds as one digit if possible.
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00:00:06 -> 6
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ss Same as above but always two digits. 0 is prepended if the second is one digit.
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00:00:06 -> 06
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yy The last two digits of the year. When parsing, the current century is assumed.
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2012 AD -> 12
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yyyy The year, padded to at least four digits. Is always positive, even when the year is BC. When the year is more than four digits, '+' is prepended.
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2012 AD -> 2012
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24 AD -> 0024
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24 BC -> 00024
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12345 AD -> +12345
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YYYY The year without any padding. Is always positive, even when the year is BC.
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2012 AD -> 2012
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24 AD -> 24
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24 BC -> 24
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12345 AD -> 12345
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More patterns can be found here:
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https://nim-lang.org/docs/times.html#parsing-and-formatting-dates
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EXAMPLES:
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datediff 2000-01-01 2001-01-01
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# 366
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datediff -s -f "yyyy" 2022 2025
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# 94694400
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TZ='America/Anchorage' datediff -h -f "yyyy-MM-dd-HH" 2022-03-13-01 2022-03-13-04
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# 2 # Because of DST change
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```
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### Build
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Use `just` as modern alternative to `make`: https://github.com/casey/just or manually run commands in `Justfile`
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```
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just build
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```
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### Alternative
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There are greater tools available:
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https://github.com/hroptatyr/dateutils
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>>>>>>> 7b9e4d9 (First commit)

‎datediff.nim

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import std/[ times, strutils]
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import docopt
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proc perr(s: string, i: int) =
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writeLine(stderr, "ERROR: " & s)
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flushFile(stderr)
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quit i
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proc pinf(s: string, verbose: bool) =
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if verbose:
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writeLine(stderr, "INFO: " & s)
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flushFile(stderr)
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let doc = """
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datediff - Show dates difference in specific format
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+ optionaly select a timezone with TZ environment variable
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Use tzselect(8) to find your TZ zone
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USAGE:
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datediff [options] [--] <DATE1> <DATE2>
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datediff --help
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OPTIONS:
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-f --format=FORMAT Format for date [default: yyyy-MM-dd]
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-v --verbose Show what is going on
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--help Show this help
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-s --seconds Output in: Seconds
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-m --minutes Output in: Minutes
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-h --hours Output in: Hours
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-d --days Output in: Days (This is default)
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-w --weeks Output in: Weeks
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FORMATTING:
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FORMAT is parsing DATE inputs as follows:
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d Numeric value representing the day of the month, it will be either one or two digits long.
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1/04/2012 -> 1
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21/04/2012 -> 21
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dd Same as above, but is always two digits.
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1/04/2012 -> 01
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21/04/2012 -> 21
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h The hours in one digit if possible. Ranging from 1-12.
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5pm -> 5
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2am -> 2
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hh The hours in two digits always. If the hour is one digit, 0 is prepended.
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5pm -> 05
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11am -> 11
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H The hours in one digit if possible, ranging from 0-23.
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5pm -> 17
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2am -> 2
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HH The hours in two digits always. 0 is prepended if the hour is one digit.
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5pm -> 17
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2am -> 02
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m The minutes in one digit if possible.
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5:30 -> 30
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2:01 -> 1
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mm Same as above but always two digits, 0 is prepended if the minute is one digit.
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5:30 -> 30
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2:01 -> 01
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M The month in one digit if possible.
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September -> 9
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December -> 12
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MM The month in two digits always. 0 is prepended if the month value is one digit.
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September -> 09
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December -> 12
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s Seconds as one digit if possible.
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00:00:06 -> 6
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ss Same as above but always two digits. 0 is prepended if the second is one digit.
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00:00:06 -> 06
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yy The last two digits of the year. When parsing, the current century is assumed.
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2012 AD -> 12
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yyyy The year, padded to at least four digits. Is always positive, even when the year is BC. When the year is more than four digits, '+' is prepended.
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2012 AD -> 2012
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24 AD -> 0024
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24 BC -> 00024
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12345 AD -> +12345
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YYYY The year without any padding. Is always positive, even when the year is BC.
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2012 AD -> 2012
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24 AD -> 24
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24 BC -> 24
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12345 AD -> 12345
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More patterns can be found here:
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https://nim-lang.org/docs/times.html#parsing-and-formatting-dates
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EXAMPLES:
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datediff 2000-01-01 2001-01-01
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# 366
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datediff -s -f "yyyy" 2022 2025
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# 94694400
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TZ='America/Anchorage' datediff -h -f "yyyy-MM-dd-HH" 2022-03-13-01 2022-03-13-04
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# 2 # Because of DST change
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""".dedent()
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let args = docopt(doc, version = "0.1.0", optionsFirst = true)
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var
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verboseBool = false
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timeFormat : TimeFormat
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dateTime1 : DateTime
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dateTime2 : DateTime
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if not args["<DATE1>"]:
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perr("Missing input <DATE1>", 1)
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if not args["<DATE2>"]:
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perr("Missing input <DATE2>", 1)
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if args["--verbose"]:
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verboseBool = true
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pinf("Verbose output", verboseBool)
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if not args["--format"]:
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perr("Did not found FORMAT. See --help", 2)
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else:
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pinf("Specified format is: " & $args["--format"], verboseBool)
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try:
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timeFormat = initTimeFormat($args["--format"])
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except:
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perr(getCurrentExceptionMsg(), 3)
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pinf("Parsing DATE1: " & $args["<DATE1>"], verboseBool)
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try:
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dateTime1 = parse($args["<DATE1>"], timeFormat)
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except:
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perr(getCurrentExceptionMsg(), 3)
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pinf("Parsing DATE2: " & $args["<DATE2>"], verboseBool)
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try:
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dateTime2 = parse($args["<DATE2>"], timeFormat)
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except:
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perr(getCurrentExceptionMsg(), 3)
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pinf("Duration...", verboseBool)
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let dur = abs(dateTime1 - dateTime2)
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# Duration can be: inWeeks inDays inHours inMinutes inSeconds inMilliseconds inMicroseconds inNanoseconds
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if args["--seconds"]:
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echo dur.inSeconds
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elif args["--minutes"]:
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echo dur.inMinutes
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elif args["--hours"]:
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echo dur.inHours
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elif args["--weeks"]:
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echo dur.inWeeks
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else:
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echo dur.inDays

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