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6.53 DateTime
- Defined in namespace Smalltalk
- Category: Language-Data types
- My instances represent timestamps.
6.53.1 DateTime class: information
- clockPrecision
- Answer `ClockPrecision'.
- initialize
- Initialize the receiver's class variables
6.53.2 DateTime class: instance creation
- now
- Answer an instance of the receiver referring to the current date and time.
- readFrom: aStream
- Parse an instance of the receiver from aStream
- year: y day: d hour: h minute: min second: s
- Answer a DateTime denoting the d-th day of the given year, and setting the time part to the given hour, minute, and second
- year: y day: d hour: h minute: min second: s offset: ofs
- Answer a DateTime denoting the d-th day of the given year. Set the offset field to ofs (a Duration), and the time part to the given hour, minute, and second
- year: y month: m day: d hour: h minute: min second: s
- Answer a DateTime denoting the d-th day of the given (as a number) month and year, setting the time part to the given hour, minute, and second
- year: y month: m day: d hour: h minute: min second: s offset: ofs
- Answer a DateTime denoting the d-th day of the given (as a number) month and year. Set the offset field to ofs (a Duration), and the the time part to the given hour, minute, and second
6.53.3 DateTime class: instance creation (non-ANSI)
- fromDays: days seconds: secs offset: ofs
- Answer a DateTime denoting the d-th day of the given (as a number) month and year. Set the offset field to ofs (a Duration), and the the time part to the given hour, minute, and second
6.53.4 DateTime: basic
- + aDuration
- Answer a new Date pointing dayCount past the receiver
- - aDateTimeOrDuration
- Answer a new Date pointing dayCount before the receiver
6.53.5 DateTime: computations
- asSeconds
- Answer the date as the number of seconds from 1/1/1901.
- dayOfWeek
- Answer the day of week of the receiver. Unlike Dates, DateAndTimes have 1 = Sunday, 7 = Saturday
- hour
- Answer the hour in a 24-hour clock
- hour12
- Answer the hour in a 12-hour clock
- hour24
- Answer the hour in a 24-hour clock
- meridianAbbreviation
- Answer either #AM (for anti-meridian) or #PM (for post-meridian)
- minute
- Answer the minute
- second
- Answer the month represented by the receiver
6.53.6 DateTime: printing
- printOn: aStream
- Print a representation for the receiver on aStream
6.53.7 DateTime: splitting in dates & times
- asDate
- Answer a Date referring to the same day as the receiver
- asTime
- Answer a Time referring to the same time (from midnight) as the receiver
- at: anIndex
- Since in the past timestamps were referred to as Arrays containing a Date and a Time (in this order), this method provides access to DateTime objects like if they were two-element Arrays.
6.53.8 DateTime: storing
- storeOn: aStream
- Store on aStream Smalltalk code compiling to the receiver
6.53.9 DateTime: testing
- < aDateTime
- Answer whether the receiver indicates a date preceding aDate
- = aDateTime
- Answer whether the receiver indicates the same date as aDate
- hash
- Answer an hash value for the receievr
6.53.10 DateTime: time zones
- asLocal
- Answer the receiver, since DateTime objects store themselves in Local time
- asUTC
- Convert the receiver to UTC time, and answer a new DateTime object.
- offset
- Answer the receiver's offset from UTC to local time (e.g. +3600 seconds for Central Europe Time, -3600*6 seconds for Eastern Standard Time). The offset is expressed as a Duration
- offset: anOffset
- Answer a copy of the receiver with the offset from UTC to local time changed to anOffset (a Duration).
- timeZoneAbbreviation
- Answer an abbreviated indication of the receiver's offset, expressed as `shhmm', where `hh' is the number of hours and `mm' is the number of minutes between UTC and local time, and `s' can be `+' for the Eastern hemisphere and `-' for the Western hemisphere.
- timeZoneName
- Answer the time zone name for the receiver (currently, it is simply `GMT +xxxx', where `xxxx' is the receiver's #timeZoneAbbreviation).
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