walltime-js

init = (helpers, rule, TimeZoneTime) -> # A Zone represents an Olson file line describing a steady state between two dates (or infinity for the last line of most zones) # and either a static time offset or set of rules to apply to determine the offset from "Local Time" class Zone constructor: (@name, @_offset, @_rule, @format, @_until, currZone) -> [isNegative, offsetHours, offsetMins, offsetSecs] = helpers.Time.ParseGMTOffset @_offset @offset = negative: isNegative hours: offsetHours mins: offsetMins secs: if isNaN(offsetSecs) then 0 else offsetSecs begin = if currZone then helpers.Time.MakeDateFromTimeStamp(currZone.range.end.getTime() + 1) else helpers.Time.MinDate() @range = begin: begin end: @_parseUntilDate @_until _parseUntilDate: (til) -> # Doing the long parsing of the until field # Example: 1936 Mar 1 2:00 # Example: 1883 Nov 18 12:14:48 # Chihuahua: 1998 Apr Sun>=1 3:00 # Asia/Baku: 1992 Sep lastSat 23:00 [year, monthName, day, time] = til.split " " [neg, h, mi, s] = if time then helpers.Time.ParseGMTOffset time else [false, 0, 0, 0] s = if isNaN(s) then 0 else s # return max date if we have no values return helpers.Time.MaxDate() if !year || year == "" # Otherwise, parse what we have year = parseInt year, 10 month = if monthName then helpers.Months.MonthIndex monthName else 0 # default to 1 day or= "1" # Check for day ranges: Sun>=1 if helpers.Months.IsDayOfMonthRule day day = helpers.Months.DayOfMonthByRule day, year, month # Check for day ranges: lastSat else if helpers.Months.IsLastDayOfMonthRule day day = helpers.Months.LastDayOfMonthRule day, year, month else day = parseInt day, 10 standardTime = helpers.Time.StandardTimeToUTC @offset, year, month, day, h, mi, s # The end time is not inclusive, so back off by 1 millisecond endTime = helpers.Time.MakeDateFromTimeStamp(standardTime.getTime() - 1) # The end time here is standard, but there are situations where it should have a dst applied (australasia) # We are now accounting for this with updateEndForRules return endTime updateEndForRules: (getRulesNamed) -> # Standard Time if @_rule == "-" or @_rule == "" # No Save return # Static Offset if @_rule.indexOf(":") >= 0 # Add on the static savings to the end [hours, mins] = helpers.Time.ParseTime @_rule @range.end = helpers.Time.ApplySave @range.end, { hours: hours, mins: mins } # Applying a rule, which a rule set will do for us. rules = new rule.RuleSet((getRulesNamed @_rule), @) endSave = rules.getYearEndDST @range.end @range.end = helpers.Time.ApplySave @range.end, endSave UTCToWallTime: (dt, getRulesNamed) -> # Standard Time if @_rule == "-" or @_rule == "" # Apply the current offset, but no save. return new TimeZoneTime dt, @, helpers.noSave # Static Offset if @_rule.indexOf(":") >= 0 # Add on the static savings and the offset [hours, mins] = helpers.Time.ParseTime @_rule return new TimeZoneTime dt, @, { hours: hours, mins: mins } # Applying a rule, which a rule set will do for us. rules = new rule.RuleSet((getRulesNamed @_rule), @) rules.getWallTimeForUTC dt WallTimeToUTC: (dt, getRulesNamed) -> # Standard Time if @_rule == "-" or @_rule == "" # Apply the current offset, but no save. return helpers.Time.StandardTimeToUTC @offset, dt # Static Offset if @_rule.indexOf(":") >= 0 # Add on the static savings and the offset [hours, mins] = helpers.Time.ParseTime @_rule return helpers.Time.WallTimeToUTC @offset, { hours: hours, mins: mins }, dt # Applying a rule, which a rule set will do for us. rules = new rule.RuleSet((getRulesNamed @_rule), @) rules.getUTCForWallTime dt, @offset IsAmbiguous: (dt, getRulesNamed) -> # Standard Time if @_rule == "-" or @_rule == "" # No DST rules / changes in effect, always false return false # Static Offset if @_rule.indexOf(":") >= 0 utcDt = helpers.Time.StandardTimeToUTC @offset, dt # The only time this would be ambiguous is at the beginning or end of the zone [hours, mins] = helpers.Time.ParseTime @_rule makeAmbigZone = (begin) -> ambigZone = begin: @range.begin end: helpers.Time.ApplySave(@range.begin, { hours: hours, mins: mins }) if ambigZone.end.getTime() < ambigZone.begin.getTime() tmp = ambigZone.begin ambigZone.begin = ambigZone.end ambigZone.end = tmp ambigZone ambigCheck = makeAmbigZone @range.begin return true if ambigCheck.begin.getTime() <= utcDt.getTime() < ambigCheck.end.getTime() ambigCheck = makeAmbigZone @range.end ambigCheck.begin.getTime() <= utcDt.getTime() < ambigCheck.end.getTime() # Applying a rule, which a rule set will do for us. rules = new rule.RuleSet((getRulesNamed @_rule), @) rules.isAmbiguous dt, @offset class ZoneSet constructor: (@zones = [], @getRulesNamed) -> # Set a name from the passed in zones or default to "" if @zones.length > 0 @name = @zones[0].name else @name = "" # TODO: Does not check for consistent names on load? # TODO: Update the end times by checking for year end DST situations (australasia) zone.updateEndForRules for zone in @zones # Adds a zone to this sets collection add: (zone) -> # Update the name of the zone if this is the first zone we're adding if @zones.length == 0 and @name == "" @name = zone.name # Do not allow different named zones to be added if @name != zone.name throw new Error "Cannot add different named zones to a ZoneSet" # Add this zone to the current zones @zones.push zone findApplicable: (dt, useOffset = false) -> ts = dt.getTime() findOffsetRange = (zone) -> # TODO: Find if there should be a DST rule applied begin: helpers.Time.UTCToStandardTime zone.range.begin, zone.offset end: helpers.Time.UTCToStandardTime zone.range.end, zone.offset found = null for zone in @zones range = if !useOffset then zone.range else findOffsetRange(zone) if range.begin.getTime() <= ts <= range.end.getTime() found = zone break found getWallTimeForUTC: (dt) -> applicable = @findApplicable dt return new TimeZoneTime(dt, helpers.noZone, helpers.noSave) if not applicable applicable.UTCToWallTime dt, @getRulesNamed getUTCForWallTime: (dt) -> # TODO: We are not accounting for DST rules in the ranges for zones applicable = @findApplicable dt, true return dt if not applicable applicable.WallTimeToUTC dt, @getRulesNamed isAmbiguous: (dt) -> # TODO: We are not accounting for DST rules in the ranges for zones # TODO: There could be ambiguities when moving from a static offset to a named rule or no offset. applicable = @findApplicable dt, true return false if not applicable applicable.IsAmbiguous dt, @getRulesNamed lib = Zone: Zone ZoneSet: ZoneSet if typeof window == 'undefined' req_helpers = require "./helpers" req_rule = require "./rule" req_TimeZoneTime = require "./timezonetime" module.exports = init(req_helpers, req_rule, req_TimeZoneTime) else if typeof define != 'undefined' define ["olson/helpers", "olson/rule", "olson/timezonetime"], init else @.WallTime or= {} @.WallTime.zone = init(@.WallTime.helpers, @.WallTime.rule, @.WallTime.TimeZoneTime)