Date.lua

Functions

date_to_seconds

INPUT:
This library function required the following inputs/parameters.

• Table of dates
  • Example: t = { {year=2000,month=12,day=13}, {year=1987,month=4,day=30,hour=10}, {year=2020,month=1,day=10} }

OUTPUT:
This library function delivers the following output/parameters.

• Sorted table of dates in seconds since 1970
  • temp = { 546775200, 976708800, 1578657600 }

CODING EXAMPLE:

-- Include/Call for this library
require("date")
temp = date.date_to_seconds(t) --see table t above
for a,b in ipairs(temp) do print(b) end
--546775200 
--976708800
--1578657600

seconds_to_date

INPUT:
This library function required the following inputs/parameters.

• Table of seconds since 1970
  • Example: t = { 546775200, 976708800, 1578657600 }

OUTPUT:
This library function deliverers the following output/parameters.

• Will give a table with a formated string
  • temp = { {Thu Apr 30 10:00:00 UTC 1987}, {Wed Dec 13 12:00:00 UTC 2000}, {Fri Jan 10 12:00:00 UTC 2020} }

CODING EXAMPLE:

-- Include/Call for this library
require("date")
temp = date.seconds_to_date(t) --see t above
-- the formated string is found in the top of date.lua 
-- is format = "%a %b %d %X %Z %Y"

string_to_table

INPUT:
This library function required the following inputs/parameters.

• Formatted string with date (of format os.date("%a %b %d %X %Z %Y"))
  • Example: str = "Mon Nov 26 19:56:10 UTC 2007"

OUTPUT:
This library function deliverers the following output/parameters.

• Will give a table with year, month, day, hour, min, sec, isdst

CODING EXAMPLE:

-- Include/Call for this library
require("date")
temp = date.string_to_table(os.date(date.format))

date_diff

INPUT:
This library function required the following inputs/parameters.

• Two dates as seconds to difference
  • Example: (546775200, 976708800)
    • Thu Apr 30 10:00:00 UTC 1987, Wed Dec 13 12:00:00 UTC 2000

OUTPUT:
This library function deliverers the following output/parameters.

• A table
  • temp = { min=0, day=17, month=8,sec=0,hour=2, year=13}

CODING EXAMPLE:

-- Include/Call for this library
require("date")
temp = date.date_diff(546775200, 976708800)
--temp will be valued as above. This will not be completely accurate in relation to leap years...

num_month_name

INPUT:
This library function required the following inputs/parameters.

• Number of month to match

OUTPUT:
This library function deliverers the following output/parameters.

• String of Full name of the month

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.num_month_name(7)
--July

num_month_name_abr

INPUT:
This library function required the following inputs/parameters.

• Number

OUTPUT:
This library function deliverers the following output/parameters.

• String of 3 letter abbreviation of

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.num_month_name_abr(7)
--Jul

name_month_num

INPUT:
This library function required the following inputs/parameters.

• String - Full name of month to match

OUTPUT:
This library function deliverers the following output/parameters.

• Number of Month matched

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.name_month_num("July")
--7

abr_month_num

INPUT:
This library function required the following inputs/parameters.

• String of Abbreviation of month name

OUTPUT:
This library function deliverers the following output/parameters.

• Number of Month

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.abr_month_num("Jul")
--7

num_dow_name

INPUT:
This library function required the following inputs/parameters.

• Number of Day of Week
  • Starts with Sunday -Saturday

OUTPUT:
This library function deliverers the following output/parameters.

• String of Full name of the month

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.num_dow_name(6)
--Friday

num_dow_abr

INPUT:
This library function required the following inputs/parameters.

• Number of Day of Week
  • Starts with Sunday -Saturday

OUTPUT:
This library function deliverers the following output/parameters.

• String of Full name of the month

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.num_dow_abr(6)
--Fri

name_dow_num

INPUT:
This library function required the following inputs/parameters.

• Give the full name of a Day of Week
  • Starts with Sunday -Saturday

OUTPUT:
This library function deliverers the following output/parameters.

• Number of day of week

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.name_dow_num("Friday")
--6

abr_dow_num

INPUT:
This library function required the following inputs/parameters.

• Give the abbreviated name of a Day of Week
  • Starts with Sunday -Saturday

OUTPUT:
This library function deliverers the following output/parameters.

• Number of day of week

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.name_dow_num("Fri")
--6

what_tz

INPUT:
This library function required the following inputs/parameters.

• No input needed

OUTPUT:
This library function deliverers the following output/parameters.

• Will read /etc/TZ and output the contents

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.what_tz())
--great if want to do os.date() and want the timezone also. 
-- lua os.date() doesn't show the timezone

change_tz

This may change a bit in the future. /etc/TZ maybe buggy

INPUT:
This library function required the following inputs/parameters.

• String of Timezone name and offset
  • EST-5

OUTPUT:
This library function deliverers the following output/parameters.

• Output result and what the timezone is
  • result Success or failure
  • just runs what_tz and outputs

CODING EXAMPLE:

-- Include/Call for this library
require("date")
print(date.change_tz("EST+5")) -- has to be reverse or EST-5. Still don't know why
--will output if able to write to the file and the set timezone