Parsing dates
For some reason I started maintaining PHP's strtotime() function, which parses a strings containing a date/time representation, such as "2004-04-18 17:59 CEST", "April 18, 2004" and the like. With so many different formats one guy in the past crafted a parser for this basing the syntax on GNU tar . The original function had some problems, or was missing some formats (such as the highly useful ISO 8601 formats) and during time this original parser was extended. it might have been a nice and simple bison parser, with a hand craften lexer, but I can assure you that it is now shitty, buggy and totaly unmaintainable. Nobody knows what formats it's supposed to parse either.
With those four problems in my head I decided to redo this shitty old and messy parser by using re2c to do the parsing. Their is a problem though as I don't know which format it's supposed to parse at all (except the GNU tar things and ISO 8601 stuff) so I'm asking you guys which formats it should be able to parse, and which formats you already parse with the strtotime() function.
Comments
This one's odd because the time comes before the year, but it's the locale standard.
$ date +"%c" Sun Apr 18 18:36:57 2004
- These are the only strtotime formats I already use:
-
strtotime ("+20 minutes") strtotime ("+3 month") strtotime ("Monday") strtotime ("2001-10-24 15:22:13")
I think it would be good to be able to parse the default timstamp and date formats for postgresql, mysql and probably oracle and mssql. I only use postgresql so I can only point you here:
http://www.postgresql.org/docs/7.4/static/datatype-datetime.html
Parsing anything that a database could spit out would be great...
culley
Like culley's suggestion regarding database date formats, consider also typical
webserver log date formats. For example, for Apache's logs: http://httpd.apache.org/docs/logs.html http://httpd.apache.org/docs-2.0/logs.html
Also, how about operating system timestamps: http://weblogs.asp.net/oldnewthing/archive/2003/09/05/54806.aspx
There may be some good clues in the GNU C Library: http://www.gnu.org/software/libc/manual/html_node/Calendar-Time.html#Calendar%20Time
Maybe some clues here in POSIX Locale: http://www.opengroup.org/onlinepubs/007908799/xbd/locale.html#tag_005_003_005
Here are some additional database date and time function format references: http://dev.mysql.com/doc/mysql/en/Date_and_time_functions.html http://otn.oracle.com/tech/blaf/specs/commonFormats.html http://www.sswug.org/searchresults.asp?keywordstofind2=date%20time
For me, the most useful things about strftime() are doing relative date math ("+2 days") ("1 sunday ago") that properly accounts for DST switches and stuff based on days of the week ("next Monday").
Life Line
Specify whether public transport stops have tactile paving
Determine the heights of kerbs at crossings
Specify whether crosswalks have tactile paving
Survey if places still exist
Survey hairdresser's customers
Specify whether kerbs have tactile paving
Determine the heights of kerbs
Specify what can be recycled in recycling containers
Specify type of recycling amenities
Specify path surfaces
Survey if places still exist
Specify whether there are cycleways
Specify whether roads have lane markings
Specify whether roads have sidewalks
Specify whether pedestrian crossings have islands
Specify whether pedestrian crossings have traffic signals
Specify road surfaces
Specify access to playgrounds
Specify whether places take fees to visit
Survey whether opening hours are signed
Specify whether pedestrian crossings have islands
Specify whether pedestrian crossings have traffic signals
Determine whether any glass or just glass bottles can be recycled here
Specify type of recycling amenities
Determine place names

Shortlink
This article has a short URL available: https://drck.me/parsing-dates-37r