darcs-2.10.2: a distributed, interactive, smart revision control system

Copyright2003 Peter Simons 2003 David Roundy
Safe HaskellNone






getIsoDateTime :: IO String Source

The current time in the format returned by showIsoDateTime

readUTCDate :: String -> CalendarTime Source

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 Source

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 dateTime

getLocalTz :: IO Int Source

Return the local timezone offset from UTC in seconds

englishDateTime :: CalendarTime -> CharParser a CalendarTime Source

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 Source

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) Source

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

iso8601Interval :: Int -> CharParser a (Either TimeDiff (MCalendarTime, MCalendarTime)) Source

Intervals in ISO 8601, e.g.,

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

See iso8601Duration

iso8601Duration :: CharParser a TimeDiff Source

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 -> IO String Source

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 Source

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 Source

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

toMCalendarTime :: CalendarTime -> MCalendarTime Source

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

unsafeToCalendarTime :: MCalendarTime -> CalendarTime Source

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 Source

Zero the time fields of a CalendarTime