IsoDate

Read/interpret a date string, assuming UTC if timezone is not specified in the string (see readDate) Warning! This errors out if we fail to interpret the date

parseDate :: Int -> String -> Either ParseError MCalendarTime

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Parse a date string, assuming a default timezone if the date string does not specify one. The date formats understood are those of showIsoDateTime and date_time

getLocalTz :: IO Int

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Return the local timezone offset from UTC in seconds

englishDateTime :: CalendarTime -> CharParser a CalendarTime

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In English, either a date followed by a time, or vice-versa, e.g,

yesterday at noon
yesterday tea time
12:00 yesterday

See englishDate and englishTime Uses its first argument as now, i.e. the time relative to which yesterday, today etc are to be interpreted

englishInterval :: CalendarTime -> CharParser a TimeInterval

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English expressions for intervals of time,

before tea time (i.e. from the beginning of time)
after 14:00 last month (i.e. till now)
between last year and last month
in the last three months (i.e. from then till now)
4 months ago (i.e. till now; see englishAgo)

englishLast :: CalendarTime -> CharParser a (CalendarTime, CalendarTime)

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Durations in English that begin with the word "last", E.g. "last 4 months" is treated as the duration between 4 months ago and now

iso8601_interval :: Int -> CharParser a (Either TimeDiff (MCalendarTime, MCalendarTime))

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Intervals in ISO 8601, e.g.,

2008-09/2012-08-17T16:30
2008-09/P2Y11MT16H30M
P2Y11MT16H30M/2012-08-17T16:30

See iso8601_duration

iso8601_duration :: CharParser a TimeDiff

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Durations in ISO 8601, e.g.,

P4Y (four years)
P5M (five months)
P4Y5M (four years and five months)
P4YT3H6S (four years, three hours and six seconds)

cleanLocalDate :: String -> String

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Convert a date string into ISO 8601 format (yyyymmdd variant) assuming local timezone if not specified in the string Warning! This errors out if we fail to interpret the date

resetCalendar :: CalendarTime -> CalendarTime

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Set a calendar to UTC time any eliminate any inconsistencies within (for example, where the weekday is given as Thursday, but this does not match what the numerical date would lead one to expect)

data MCalendarTime

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An MCalenderTime is an underspecified CalendarTime It is used for parsing dates. For example, if you want to parse the date '4 January', it may be useful to underspecify the year by setting it to Nothing. This uses almost the same fields as CalendarTime, a notable exception being that we introduce mctWeek to indicate if a weekday was specified or not

Constructors

MCalendarTime

mctYear :: Maybe Int
mctMonth :: Maybe Month
mctDay :: Maybe Int
mctHour :: Maybe Int
mctMin :: Maybe Int
mctSec :: Maybe Int
mctPicosec :: Maybe Integer
mctWDay :: Maybe Day
mctYDay :: Maybe Int
mctTZName :: Maybe String
mctTZ :: Maybe Int
mctIsDST :: Maybe Bool
mctWeek :: Bool

Instances

Show MCalendarTime

subtractFromMCal :: TimeDiff -> MCalendarTime -> MCalendarTime

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addToMCal :: TimeDiff -> MCalendarTime -> MCalendarTime

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toMCalendarTime :: CalendarTime -> MCalendarTime

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Trivially convert a CalendarTime to a fully specified MCalendarTime (note that this sets the mctWeek flag to False

unsafeToCalendarTime :: MCalendarTime -> CalendarTime

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Returns the first CalendarTime that falls within a MCalendarTime This is only unsafe in the sense that it plugs in default values for fields that have not been set, e.g. January for the month or 0 for the seconds field. Maybe we should rename it something happier. See also resetCalendar

unsetTime :: CalendarTime -> CalendarTime

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Zero the time fields of a CalendarTime

type TimeInterval = (Maybe CalendarTime, Maybe CalendarTime)

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