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Longhorn PHP date/time talk, now with Quiz
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,25 +1,25 @@ | ||
| <?xml version="1.0" encoding="ISO-8859-1"?> | ||
| <slide> | ||
| <title>Default Timezones</title> | ||
| <title>Default Timezones</title> | ||
|
|
||
| <blurb>Setting a default timezone:</blurb> | ||
| <example result="0"><![CDATA[<?php | ||
| date_default_timezone_set("Europe/Oslo"); | ||
| $ts = new DateTime("1978-12-22 09:15"); | ||
| echo $ts->format("e"); | ||
| <blurb>Setting a default timezone:</blurb> | ||
| <example result="0"><![CDATA[<?php | ||
| date_default_timezone_set("Europe/Oslo"); | ||
| $ts = new DateTime("1978-12-22 09:15"); | ||
| echo $ts->format("e"); | ||
| ?>]]></example> | ||
| <break/> | ||
|
|
||
| <blurb>Getting a default timezone:</blurb> | ||
| <example result="0"><![CDATA[<?php | ||
| $default_identifier = date_default_timezone_get(); | ||
| echo $default_identifier; | ||
| <blurb>Getting a default timezone:</blurb> | ||
| <example result="0"><![CDATA[<?php | ||
| $default_identifier = date_default_timezone_get(); | ||
| echo $default_identifier; | ||
| ?>]]></example> | ||
| <break/> | ||
|
|
||
| <blurb>Default timezone is 'guessed' in the following order:</blurb> | ||
| <list> | ||
| <bullet>~date_default_timezone_set()~ value</bullet> | ||
| <bullet>php.ini's %date.timezone% setting</bullet> | ||
| </list> | ||
| <blurb>Default timezone is 'guessed' in the following order:</blurb> | ||
| <list> | ||
| <bullet>~date_default_timezone_set()~ value</bullet> | ||
| <bullet>php.ini's %date.timezone% setting</bullet> | ||
| </list> | ||
| </slide> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,26 +1,26 @@ | ||
| <slide> | ||
| <title>Storing date/time in a database</title> | ||
| <subtitle>Conclusion</subtitle> | ||
|
|
||
| <blurb>If you want to future proof a specific date and time (Oct 1st, | ||
| 13:00)-ie, storing a time in *local time*:</blurb> | ||
| <example><![CDATA[{ | ||
| 'title' : 'Giving a talk: Advanced Date/Time handling with PHP', | ||
| 'time' : { | ||
| 'tz': 'America/Montreal', | ||
| 'dt': '2012-10-01 13:00', | ||
| } | ||
| }]]></example> | ||
| <break /> | ||
| <subtitle>Summary</subtitle> | ||
|
|
||
| <blurb>If you want to store a time for an appointment for a group of people | ||
| all in different timezones-ie, store a *specific point in time*:</blurb> | ||
| <example><![CDATA[{ | ||
| 'title' : 'Meeting about getting rid of Daylight Saving Time', | ||
| 'time' : { | ||
| 'tz': 'America/Montreal', | ||
| 'ts': 1349110800, | ||
| 'ts': ISODate("2018-04-19 15:27:32"), | ||
| 'tz': 'Europe/London', | ||
| }, | ||
| 'attendees' : [ 'Arthur David Olson', 'Paul Eggert' ], | ||
| }]]></example> | ||
| <break /> | ||
|
|
||
| <blurb>If you want to future proof a specific date and time (Oct 1st, | ||
| 13:00)-ie, storing a time in *local time*:</blurb> | ||
| <example><![CDATA[{ | ||
| 'title' : 'Giving a talk: Advanced Date/Time handling with PHP', | ||
| 'time' : { | ||
| 'dt': '2018-04-18 19:40', | ||
| 'tz': 'Europe/London', | ||
| } | ||
| }]]></example> | ||
| </slide> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| <slide> | ||
| <title>Storing date/time in a database</title> | ||
| <subtitle>Query in MongoDB</subtitle> | ||
|
|
||
| <example><![CDATA[{ | ||
| 'title' : 'Giving a talk: Advanced Date/Time handling with PHP', | ||
| 'time' : { | ||
| 'ts': ISODate("2018-04-19 15:27:32"), // ms since Epoch | ||
| 'tz': 'Europe/London', | ||
| } | ||
| }]]></example> | ||
|
|
||
| <blurb>Query:</blurb> | ||
| <example><![CDATA[ | ||
| db.dates.aggregate( { '$project' : { | ||
| local_date: { | ||
| '$dateToString' : { | ||
| format: '%Y-%m-%d %H:%M:%S', | ||
| date: '$time.ts', | ||
| timezone: '$time.tz' | ||
| } | ||
| } | ||
| } } ); | ||
| ]]></example> | ||
|
|
||
| <blurb>Result:</blurb> | ||
| <example><![CDATA[{ | ||
| "_id" : ObjectId("5ad8a9148cb588e5ea33f228"), | ||
| "local_date" : "2018-04-19 16:34:57" | ||
| }]]></example> | ||
| </slide> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| <slide> | ||
| <title>Quiz Time!</title> | ||
|
|
||
| <break lines="4"/> | ||
|
|
||
| <div effect="fade-in-out"><blurb class="big-centre">each day has *24 hours*</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">each day is *23, 24 or 25 hours*</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">every time exists *only once* during a day</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">Februari has *29 or 30* days</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">every year is *365* days</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">every year is *365 or 366* days</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">everybody understands what *PI day* is</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">everybody understands what *4/20 means*</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">timezones are *whole hour* offsets from UTC</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">timezones are *half hour* offsets from UTC</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">jump *to DST* is around March</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">the difference between standard and DST is *an hour*</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">DST is always *ahead* of standard time</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">each country has *one* timezone</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">China spans *5 geographical* timezones</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">DST rules stay always the *same*</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">DST rules are announced *at least a year* in advance</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">DST rules are announced *in advance*</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">PST is *Pacific Standard Time*</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">a timezone identifier is the capital of a region</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">date calculations are easy</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">"2018-03-31" plus month is "2018-04-31"</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">"2018-03-31" plus month is "2018-04-30"</blurb></div> | ||
| <div effect="fade-in-out"><blurb class="big-centre">every date calculation is reversable</blurb></div> | ||
| </slide> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| <?xml version="1.0" encoding="utf-8"?> | ||
| <presentation css="10gen-strict.css"> | ||
| <topic>Localization and Internationalization</topic> | ||
| <title>Time Zones and Calendars are a PITA</title> | ||
| <event>Longhorn PHP</event> | ||
| <location>Austain, TX, US</location> | ||
| <date>April 21st, 2018</date> | ||
| <speaker>Derick Rethans</speaker> | ||
| <email>derick@php.net</email> | ||
| <url>http://derickrethans.nl/talks.html</url> | ||
| <joindin>http://joind.in/23637</joindin> | ||
| <twitter>derickr</twitter> | ||
|
|
||
| <slide>slides/mongodb/title.xml</slide> | ||
| <slide>slides/mongodb/me.xml</slide> | ||
|
|
||
| <!-- INTRODUCTION --> | ||
| <slide>slides/time/quiz.xml</slide> | ||
| <slide>slides/time/problems-condensed.xml</slide> | ||
|
|
||
| <!-- PHP - IMPROVEMENTS --> | ||
| <slide>slides/time/improvements-timezones.xml</slide> | ||
| <slide>slides/time/improvements-more-on-timezones.xml</slide> | ||
| <slide>slides/time/default-timezone.xml</slide> | ||
| <slide>slides/time/timestamps-suck.xml</slide> | ||
|
|
||
| <!-- PHP - CODE EXAMPLES --> | ||
| <slide>slides/time/basic-parse-time-new.xml</slide> | ||
| <slide>slides/time/date-parse2.xml</slide> | ||
| <slide>slides/time/date-parse-from-format3.xml</slide> | ||
| <slide>slides/time/date-parse-from-format2.xml</slide> | ||
|
|
||
| <!-- DATE EXAMPLES --> | ||
| <slide>slides/time/date-modify.xml</slide> | ||
| <slide>slides/time/date-modify-immutable1.xml</slide> | ||
| <slide>slides/time/date-modify-immutable2.xml</slide> | ||
| <slide>slides/time/timezone-object-1.xml</slide> | ||
| <slide>slides/time/date-timezone.xml</slide> | ||
| <slide>slides/time/timezone-utilities-3.xml</slide> | ||
|
|
||
| <!-- INTERVALS and PERIODS --> | ||
| <slide>slides/time/intervals.xml</slide> | ||
| <slide>slides/time/intervals-2.xml</slide> | ||
| <slide>slides/time/relative-month.xml</slide> | ||
| <slide>slides/time/relative-month3.xml</slide> | ||
| <slide>slides/time/period-2.xml</slide> | ||
|
|
||
| <!-- STORING in DATABASE --> | ||
| <!-- OLD: | ||
| <slide>slides/time/in-database1.xml</slide> | ||
| <slide>slides/time/in-database2.xml</slide> | ||
| <slide>slides/time/in-database3.xml</slide> | ||
| --> | ||
| <slide>slides/time/in-database4.xml</slide> | ||
| <slide>slides/time/in-mdb1.xml</slide> | ||
|
|
||
| <!-- CALENDARS --> | ||
|
|
||
| <!-- EXIT --> | ||
| <slide>slides/time/book.xml</slide> <!-- resources --> | ||
| <slide>slides/mongodb/questions.xml</slide> | ||
| <slide>slides/mongodb/resources.xml</slide> <!-- resources --> | ||
| </presentation> |