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Miloslav Nic

Numeric representation of dates and times

Based on the international standard ISO 8601: Data elements and interchange formats

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Contents:
Characters used in place of digits
Characters used as designators
 
Date indentified by month and day numbers: complete representation
representation with reduced precision
truncated representations
 
Date identified by day numbers: complete representation
truncated representation
 
Date identified by week and day numbers: complete representation
representation with reduced precision
truncated representation
 
Time of the day: complete representation
representations with reduced precision
decimal fractions
truncated representations
 
Coordinated Universal Time (UTC): UTC
differences between local time and UTC
 
Combination of date and time: calendar date and local time
 
Periods of time: complete representations

Characters used in place of digits

C thousands and hundreds years (centuries)
Y tens and individual years
M months
D days [start at 00:00 and end at 24:00 (00:00 of the next day), as a day of the week Monday is 1 and Sunday is 7]
w weeks [the first calendar week of the year is the one that includes the first Thursday of that year]
h hours
m minutes
s seconds
n digits (positive integers)

Characters used as designators

P period designator, preceeds a duration of a period of time
T time designator, starts representation of time when date and time are combined
W week designator, starts the ordinal number of a calendar week within the year
Z time-zone designator, follows time of the day in Coordinated Universal Time (UTC)

Date indentified by month and day numbers
complete representation
full date
basic notation: CCYYMMDD extended notation: CCYY-MM-DD

19890312
(12th March 1989)

1989-03-12
(12th March 1989)


representation with reduced precision
specific month
basic notation: CCYY-MM extended notation: not applicable

2000-02
(February 2000)


specific year
basic notation: CCYY extended notation: not applicable

1988
(year 1988)


specific century
basic notation: CC extended notation: not applicable

19
(20th century)


truncated representations
specific date in the current century
basic notation: YYMMDD extended notation: YY-MM-DD

000108
(8th January 2000)

00-01-08
(8th January 2000)


specific year and month in the current century
basic notation: -YYMM extended notation: -YY-MM

-0003
(March 2000)

-00-03
(March 2000)


specific year in the current century
basic notation: -YY extended notation: not applicable

-56
(year 2056)


specific day of a month
basic notation: --MMDD extended notation: --MM-DD

--0806
(6th August)

--08-06
(6th August)


specific month
basic notation: --MM extended notation: not applicable

--05
(May)


specific day
basic notation: ---DD extended notation: not applicable

---06
(6th day)



Date identified by day numbers
complete representation
a full date
basic notation: CCYYDDD extended notation: CCYY-DDD

2001060
(1st March 2001)

2001-060
(1st March 2001)


truncated representation
specific year and day in the current century
basic notation: YYDDD extended notation: YY-DDD

05365
(31st December 2005)

05-365
(31st December 2005)


a day of a year
basic notation: -DDD extended notation: not applicable

-032
(1st February)



Date identified by week and day numbers
complete representation
full date
basic notation: CCYYWwwD extended notation: CCYY-Www-D

2052W086
(24th February 2052(Saturday))

2052-W08-6
(24th February 2052(Saturday))


representation with reduced precision
a week in the specific year
basic notation: CCYYWww extended notation: CCYY-Www

2016W06
(6th week of the year 2016)

2016-W06
(6th week of the year 2016)


truncated representation
year, week and day in the current century
basic notation: YYWwwD extended notation: YY-Www-D

52W086
(24th February 2052(Saturday))

52-W08-6
(24th February 2052(Saturday))


year and week in the current century
basic notation: YYWww extended notation: YY-Www

16W06
(6th week of the year 2016)

16-W06
(6th week of the year 2016)


year, week, and day of the current decade
basic notation: -YWwwD extended notation: -Y-WwwD

-7W103
(7th March 2007 (Wednesday))

-7-W10-3
(7th March 2007 (Wednesday))


week and day of the current year
basic notation: -WwwD extended notation: -Www-D

-W014
(6th January 2000 (Thursday))

-W014
(6th January 2000 (Thursday))


week of the current year
basic notation: -Wwww extended notation: not applicable

-W25
(25th week of the year)


day of the current week
basic notation: -W-D extended notation: not applicable

-W-5
(Friday of this week)


day of any week
basic notation: ---D extended notation: not applicable

---5
(Friday)



Time of the day
complete representation
full time
basic notation: hhmmss extended notation: hh:mm:ss

150603
(15 hours 6 minutes 3 seconds)

15:06:03
(15 hours 6 minutes 3 seconds)


representations with reduced precision
hours and minutes
basic notation: hhmm extended notation: hh:mm

0608
(6 hours 8 minutes)

06:08
(6 hours 8 minutes)


hours
basic notation: hh extended notation: not applicable

03
(3 hours)


decimal fractions
fraction of seconds
basic notation: hhmmss,s | hhmmss.s extended notation: hh:mm:ss,s | hh:mm:ss.s

064312,234
(6 hours 43 minutes 12.234 seconds)

064312.234
(6 hours 43 minutes 12.234 seconds)

06:43:12,234
(6 hours 43 minutes 12.234 seconds)

06:43:12.234
(6 hours 43 minutes 12.234 seconds)


fraction of minutes
basic notation: hhmm,m | hhmm.m extended notation: hh:mm,m | hh:mm.m

0643,12
(6 hours 43.12 minutes)

0643.12
(6 hours 43.12 minutes)

06:43,12
(6 hours 43.12 minutes)

06:43.12
(6 hours 43.12 minutes)


fraction of hours
basic notation: hh,h | hh.h extended notation: not applicable

06,125
(6.125 hours)

06.125
(6.125 hours)


truncated representations
specific minute and second of the hour
basic notation: -mmss extended notation: -mm:ss

-0804
(8 minutes 4 seconds)

-08:04
(8 minutes 4 seconds)


specific minute of the hour
basic notation: -mm extended notation: not applicable

-08
(8th minute)


specific second of the minute
basic notation: --ss extended notation: not applicable

--07
(7th second)



Coordinated Universal Time (UTC)
UTC
full date
basic notation: hhmmssZ extended notation: hh:mm:ssZ

061223Z
(6 hours 12 minutes 23 seconds UTC)

06:12:23Z
(6 hours 12 minutes 23 seconds UTC)


hours and minutes
basic notation: hhmmZ extended notation: hh:mmZ

0612Z
(6 hours 12 minutes UTC)

06:12Z
(6 hours 12 minutes UTC)


hours
basic notation: hhZ extended notation: not applicable

06Z
(6 hours UTC)


differences between local time and UTC
local time ahead
basic notation: hhmmss+hhmm | hhmmss+hh extended notation: hh:mm:ss+hh:mm | hh:mm:ss+hh

051207+0100
(5 hours 12 minutes 7 seconds in Prague)

051207+01
(5 hours 12 minutes 7 seconds in Prague)

05:12:07+01:00
(5 hours 12 minutes 7 seconds in Prague)

05:12:07+01
(5 hours 12 minutes 7 seconds in Prague)


local time behind
basic notation: hhmmss-hhmm | hhmmss-hh extended notation: hh:mm:ss-hh:mm | hh:mm:ss-hh

051207-0500
(5 hours 12 minutes 7 seconds in New York)

051207-05
(5 hours 12 minutes 7 seconds in New York)

05:12:07-05:00
(5 hours 12 minutes 7 seconds in New York)

05:12:07-05
(5 hours 12 minutes 7 seconds in New York)



Combination of date and time
calendar date and local time
complete representation
basic notation: CCYYMMDDThhmmss extended notation: CCYY-MM-DDThh:mm:ss

20021207T062307
(7th December 2002 in 6 hours 23 minutes 7 seconds)

2002-12-07T06:23:07
(7th December 2002 in 6 hours 23 minutes 7 seconds)


examples of reduced representation
basic notation: anyTany extended notation: anyTany

030303T12
(12th hour of the 3rd March 2003)

03-03-03T12
(12th hour of the 3rd March 2003)



Periods of time
complete representations
period identified by its start and end
basic notation: CCYYMMDDThhmmss/CCYYMMDDThhmmss extended notation: not applicable

20000812T161223/20050505T050505
(period from 16 hours 12 minutes 23 seconds of 12th August 2000 till 5 hours 5 minutes 5 seconds of 5th May 2005)


period represented by its duration
basic notation: PnYnMnDTnHnMnS | PnW extended notation: not applicable

P12Y6M24DT6H12M23S
(period of 12 years 6 months 24 days 6 hours 12 minutes and 23 seconds)

P23W
(period of 23 weeks)


period represented by its start and its duration
basic notation: CCYYMMDDThhmmss/PnYnMnDTnHnMnS extended notation: not applicable

20000423/P5Y4M12DT3H23M9S
(period of 5 years 4 months 12 days 3 hours 23 minutes 9 seconds starting on 23 April 2005)


period represented by its end and its duration
basic notation: PnYnMnDTnHnMnS/CCYYMMDDThhmmss extended notation: not applicable

P5Y4M12DT3H23M9S/20000423
(period of 5 years 4 months 12 days 3 hours 23 minutes 9 seconds ending on 23 April 2005)