Getting date and time from ntp server with esp8266 node mcuElaf A.Saeed
Getting Date & Time From NTP Server With ESP8266 NodeMCU
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Getting date and time from ntp server with esp8266 node mcuElaf A.Saeed
Getting Date & Time From NTP Server With ESP8266 NodeMCU
-----------------------------------------------------------------------------------
Email: elafe1888@gmail.com
linkden: www.linkedin.com/in/elaf-a-saeed-97bbb6150
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twitter: https://twitter.com/ElafASaeed1
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This presentation provides an overview of using the Java SE 8 Date & Time API. It covers how to:
1. Create and manage date-based and time-based events including a combination of date and time into a single object using LocalDate, LocalTime, LocalDateTime, Instant, Period, and Duration
2. Work with dates and times across timezones and manage changes resulting from daylight savings including format date and times values
3. Define and create and manage date-based and time-based events using Instant, Period, Duration, and TemporalUnit
This presentation provides an overview of using the Java SE 8 Date & Time API. It covers how to:
1. Create and manage date-based and time-based events including a combination of date and time into a single object using LocalDate, LocalTime, LocalDateTime, Instant, Period, and Duration
2. Work with dates and times across timezones and manage changes resulting from daylight savings including format date and times values
3. Define and create and manage date-based and time-based events using Instant, Period, Duration, and TemporalUnit
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Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
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Brand New Date and Time API
1. Brand new
Date and Time API
March 21, 2014
HASUNUMA Kenji
khasunuma@java.net
http://www.coppermine.jp/
Twitter:
2. Preface
• JSR 310 is a new and improved date and time API
for Java.
• It is based on ISO 8601 standard.
• The reference implementation is called "ThreeTen".
• Specification Leads: Stephen Colebourne, Michael
Nascimento Santos and Roger Riggs.
3. What is time?
“Time” is described by science approaches and defined by
International Standard (SI) exactly.
Skip
10. PST (Pacific Standard Time)
Offset:-08:00 (Summer:-07:00)
JST (Japan Standard Time)
Offset:+09:00
Skip
11. Time zones (East 1/2)
Code Name Offset Summer
ECT Europe/Paris +01:00 +02:00
CAT Africa/Harare +02:00 (N/A)
ART Africa/Cairo +02:00 (N/A)
EAT Africa/Addis_Abeba +03:00 (N/A)
NET Asia/Yerevan +04:00 (N/A)
PLT Asia/Karachi +05:00 (N/A)
IST Asia/Koltaka +05:30 (N/A)
BST Asia/Dacca +06:00 (N/A)
12. Time zones (East 2/2)
Code Name Offset Summer
VST Asia/Ho_Chi_Minh +07:00 (N/A)
CTT Asia/Shanghai +08:00 (N/A)
JST Asia/Tokyo +09:00 (N/A)
ACT Australia/Darwin +09:30 (N/A)
AET Australia/Sydney +11:00 +10:00
SST Pacific/Guadalcanal +11:00 (N/A)
NST Pacific/Auckland +13:00 +12:00
MIT Pacific/Apia +14:00 +13:00
13. Time zones (West 1/2)
Code Name Offset Summer
BET America/Sao_Paulo -02:00 -03:00
AGT America/Argentina/Buenos_Aires -03:00 (N/A)
CNT America/St_Johns -03:30 -02:30
PRT America/Puerto_Rico -04:00 (N/A)
EST (N/A) -05:00 (N/A)
IET America/Indiana/Indianapolis -05:00 -04:00
14. Time zones (West 2/2)
Code Name Offset Summer
CST America/Chicago -06:00 -05:00
MST (N/A) -07:00 (N/A)
PNT America/Phoenix -07:00 (N/A)
PST America/Los_Angeles -08:00 -07:00
AST America/Anchorage -09:00 -08:00
HST (N/A) -10:00 (N/A)
15. ISO 8601
Date elements and interchange formats - Information
interchange - Representation of dates and times
Skip
16. What’s ISO 8601?
• International standard for representation of dates
and times, using information interchange.
• Based on Gregorian calendar system (1582).
• JIS X 0301 is Japanese translations with remarks
about Japanese chronology.
• ISO 8601 and Unix time are incompatible.
Unix time is basis of java.util.Date, et al.
17. Representation of time
(w/o Time zone)
• hh:mm:ss e.g. 15:30:45
• hh:mm e.g. 15:30
• hh e.g. 15
• hh:mm:ss.s e.g. 15:30:45.250
18. Representation of time
(w/Time zone)
• Add suffix based on the offset from UTC
• UTC: ‘Z’ e.g. 06:30:45Z
• Not UTC: +hh:mm or -hh:mm
e.g. 15:30:45+09:00 (JST, Asia/Tokyo)
02:30:45-08:00 (PST, America/Los_Angeles)
19. Representation of date
• date - it consists with year, month, day and week.
• calendar date YYYY-MM-DD e.g. 2014-03-21
• ordinal date YYYY-DDD e.g. 2014-080
• week date YYYY-Www-D e.g. 2014-W12-5
• Short representations:
• year-month YYYY-MM e.g. 2014-03
• year YYYY e.g. 2014
• century YY e.g. 20
• month-day --MM-DD e.g. --03-21
20. Definition of day
• a day = 24 hours = 86,400 seconds
• 00:00~24:00 (24:00 is same as next 00:00)
• Exceptions:
• Leap seconds
• Begin and end of summer time
• When the time zone is changed
21. Definition of month
• a month = 28, 29, 30 or 31 days
1 January 01~31 7 July 01~31
2 February 01~28/29 8 August 01~31
3 March 01~31 9 September 01~30
4 April 01~30 10 October 01~31
5 May 01~31 11 November 01~30
6 June 01~30 12 December 01~31
22. Definition of year
• a year = approximation days while the orbital period
of Earth (365.242 19 days), 12 months.
• common year = 365 days
• leap year = 366 days
• 0000~9999 (0000~1582 is reserved)
mod 4 mod 100 mod 400 year
Not Zero - - common year
Zero Not Zero - leap year
Zero Zero Not Zero common year
Zero Zero Zero leap year
23. Definition of week
• a week = 7 days
• 1st week of year = a week
contents the first Thursday
of the year.
• a year contents 52 or 53
weeks.
1 Monday
2 Tuesday
3 Wednesday
4 Thursday
5 Friday
6 Saturday
7 Sunday
25. Representation of date and time
• concat date and time by 'T'.
• YYYY-MM-DDThh:mm:ss[Time zone]
• Alt. YYYY-DDDThh:mm:ss[Time Zone]
• e.g.
2014-03-21T06:30
2014-03-21T15:30:45+09:00
2014-079T02:30:45-08:00
26. Definition and representation
of duration
• time amount between two time points
• date : nYnMnD e.g. 1Y3M22D
• time : nHnMnS e.g. 9H30M45S
• date and time : nYnMnDTnHnMnS
e.g. 1Y3M22DT9H30M45S
27. Definition and representation
of period
• range between two dates (adopt also two times)
• two dates : YYYY-MM-DD/YYYY-MM-DD
e.g. 2013-12-31/2014-03-21
• start date and duration : YYYY-MM-DD/PnYnMnD
e.g. 2013-12-31/P1Y3M22D
• end date and duration : PnYnMnD/YYYY-MM-DD
e.g. P1Y3M22D/2013-03-21
• duration : PnYnMnD
e.g. P1Y3M22D
29. JSR 310 : Date and Time API
• Since 2007, Reference Implementation: ThreeTen
• Relational projects:
• ThreeTen-Extra: Features dropped from JDK8,
i.e. UTC/TAI full support, Coptic chronology, et al.
https://github.com/ThreeTen/threeten-extra
• ThreeTen-Backport: JSR 310 like API for JDK7.
https://github.com/ThreeTen/threetenbp
• Joda-Time: Provides many hints to JSR 310.
http://www.joda.org/joda-time/
30. Package java.time.*
Package Description Use
java.time Basic classes usually
java.time.format Date and Time Formatter often
java.time.chrono Chronology supports partially
java.time.temporal Low-level API rarely
java.time.zone Low-level API rarely
31. Date and Time classes
Class Field Time zone ISO 8601 Chrono.
LocalDate Date N/A compatible enable
LocalDateTime Date + Time N/A compatible enable
LocalTime Time N/A compatible N/A
OffsetDateTime Date + Time offset compatible disable
OffsetTime Time offset compatible N/A
ZonedDateTime Date + Time zone id extended enable
33. Date and Time conversions
Oper. Description
of-
Create from fields.
e.g. LocalDate today = LocalDate.of(2014, 3, 21);
// today.toString() : “2014-03-21”
at-
Expand with fields.
e.g. LocalDateTime current = today.atTime(15:30);
// current.toString() : “2014-03-21T15:30:00”
to-
Truncate fields.
e.g. LocalDate someday = current.toLocalDate();
// someday.toString() : “2014-03-21”
34. Date and Time operators
Oper. Description
isBefore
isEqual
isAfter
Compare with other date/time.
e.g. LocalDate today = LocalDate.of(2014, 3, 21);
boolean b = today.isAfter(LocalDate.of(2014, 3, 19));
// b == true
plus-
minus-
Add/subtract field value.
e.g. LocalDate tomorrow = today.plusDays(2);
// tomorrow.toString() : “2014-03-23”
isLeapYear
Verify a date is leap year.
e.g. boolean leap = today.isLeapYear();
// leap == false
35. Date and Time formatting
Method Description
toString()
Format using default formatter.
e.g. String s = today.toString();
// s : “2014-03-21”
format(DateTimeFormatter f)
Format using custom formatter.
e.g. String s = today.format(formatter);
parse(String s)
Parse using default formatter.
e.g. LocalDate d = LocalDate
.parse(“2014-03-21”);
parse(String s,
DateTimeFormatter f)
Parse using custom formatter.
e.g. LocalDate d = LocalDate
.parse(“2014-03-21”, formatter);
36. Chronology
• Date and Time API supports ISO 8601 and some local
chronology (e.g., Japanese Era, Minguo Era, Thai
Buddhist Era and Hijrah Era).
• ChronoLocalDate and its sub-classes (incl. LocalDate)
support chronology.
• ChronoLocalDateTime<D>/ChronoZonedDateTime<D>
instead of LocalDateTime/ZonedDateTime
• dates/times that have different chronology can convert
by from method each other.
43. Instant
• Representation of a time-point.
• The precision is a nano second.
• The epoch is 1970-01-01T00:00:00Z
• Convert from/to LocalDateTime, OffsetDateTime or
ZonedDateTime.
• Convert from/to java.util.Date, which means that
Instant is the only interface to java.util.Date.
44. Duration and Period
• Representations of period (ISO 8601).
• Period (JSR 310) is a period (ISO 8601) between two
dates and represents as a date-scale.
i.e. format as "P1Y2M3D"
• Duration (JSR 310) is a period (ISO 8601) between
any two temporals and represents as a time-scale.
i.e. format as "PT15H30M45D"
• Attention: those definitions are different from them of
ISO 8601.
45. Clock and now method
• Provider of the current instant.
• There are some clocks, having relation of zones (incl.
current zone), fixed clock (for testing) and custom.
• By default, it uses the clock of current zone.
• now method (LocalDate, et al.) creates a temporal
instance from a clock.
e.g. LocalDate.now();
LocalDate.now(zoneId);
LocalDate.now(Clock.fixed(instant, ZoneId.systemDefault);