time-exts-2.1.0: Efficient Timestamps

Safe HaskellNone
LanguageHaskell2010

Data.Time.Exts.Local

Contents

Description

Local timestamps of varying granularity.

Synopsis

Local Class

class Local u where Source

The local timestamp type class.

Methods

localBase :: u -> Int64 Source

Get the base component of a local timestamp.

localZone :: u -> Word8 Source

Get the zone component of a local timestamp.

Instances

Local Timestamps

data LocalDate Source

Days since Unix epoch.

Constructors

LocalDate 

Fields

_ld_day_base :: !Int32
 
_ld_day_zone :: !Word8
 

Instances

data LocalDateTime Source

Seconds since Unix epoch (including leap seconds).

Constructors

LocalDateTime 

Fields

_ldt_sec_base :: !Int64
 
_ldt_sec_zone :: !Word8
 

Instances

data LocalDateTimeMillis Source

Milliseconds since Unix epoch (including leap seconds).

Constructors

LocalDateTimeMillis 

Fields

_ldt_mil_base :: !Int64
 
_ldt_mil_zone :: !Word8
 

Instances

data LocalDateTimeMicros Source

Microseconds since Unix epoch (including leap seconds).

Constructors

LocalDateTimeMicros 

Fields

_ldt_mic_base :: !Int64
 
_ldt_mic_zone :: !Word8
 

Instances

data LocalDateTimeNanos Source

Nanoseconds since Unix epoch (including leap seconds).

Constructors

LocalDateTimeNanos 

Fields

_ldt_nan_base :: !Int64
 
_ldt_nan_nano :: !Int16
 
_ldt_nan_zone :: !Word8
 

Instances

data LocalDateTimePicos Source

Picoseconds since Unix epoch (including leap seconds).

Constructors

LocalDateTimePicos 

Fields

_ldt_pic_base :: !Int64
 
_ldt_pic_pico :: !Int32
 
_ldt_pic_zone :: !Word8
 

Instances

Create Local Timestamps

createLocalDate :: Year -> Month -> Day -> TimeZone -> LocalDate Source

Create a local date.

>>> createLocalDate 2013 November 03 Pacific_Standard_Time
2013-11-03 PST

createLocalDateTime :: Year -> Month -> Day -> Hour -> Minute -> Second -> TimeZone -> LocalDateTime Source

Create a local date and time.

>>> createLocalDateTime 2013 November 03 22 55 52 South_Africa_Standard_Time
2013-11-03 22:55:52 SAST

createLocalDateTimeMillis :: Year -> Month -> Day -> Hour -> Minute -> Second -> Millis -> TimeZone -> LocalDateTimeMillis Source

Create a local date and time with millisecond granularity.

>>> createLocalDateTimeMillis 2013 November 03 13 57 43 830 Mountain_Standard_Time
2013-11-03 13:57:43.830 MST

createLocalDateTimeMicros :: Year -> Month -> Day -> Hour -> Minute -> Second -> Micros -> TimeZone -> LocalDateTimeMicros Source

Create a local date and time with microsecond granularity.

>>> createLocalDateTimeMicros 2013 November 03 21 01 42 903539 Coordinated_Universal_Time 
2013-11-03 21:01:42.903539 UTC

createLocalDateTimeNanos :: Year -> Month -> Day -> Hour -> Minute -> Second -> Nanos -> TimeZone -> LocalDateTimeNanos Source

Create a local date and time with nanosecond granularity.

>>> createLocalDateTimeNanos 2013 November 04 06 05 07 016715087 Japan_Standard_Time
2013-11-04 06:05:07.016715087 JST

createLocalDateTimePicos :: Year -> Month -> Day -> Hour -> Minute -> Second -> Picos -> TimeZone -> LocalDateTimePicos Source

Create a local date and time with picosecond granularity.

>>> createLocalDateTimePicos 2013 November 03 23 13 56 838238648311 Eastern_European_Time
2013-11-03 23:13:56.838238648311 EET

Get Current Local Timestamps

getCurrentLocalDate :: City -> IO LocalDate Source

Get the current local date from the system clock.

>>> getCurrentLocalDate London 
2013-11-03 GMT

getCurrentLocalDateTime :: City -> IO LocalDateTime Source

Get the current local date and time from the system clock.

>>> getCurrentLocalDateTime New_York 
2013-11-03 16:38:16 EST

getCurrentLocalDateTimeMillis :: City -> IO LocalDateTimeMillis Source

Get the current local date and time with millisecond granularity from the system clock.

>>> getCurrentLocalDateTimeMillis Auckland
2013-11-04 10:46:13.123 NZDT

getCurrentLocalDateTimeMicros :: City -> IO LocalDateTimeMicros Source

Get the current local date and time with microsecond granularity from the system clock.

>>> getCurrentLocalDateTimeMicros Tel_Aviv 
2013-11-03 23:55:30.935387 IST

getCurrentLocalDateTimeNanos :: City -> IO LocalDateTimeNanos Source

Get the current local date and time with nanosecond granularity from the system clock.

>>> getCurrentLocalDateTimeNanos Brussels 
2013-11-03 23:01:07.337488000 CET

Note that this functions calls gettimeofday behind the scenes. Therefore, the resultant timestamp will have nanosecond granularity, but only microsecond resolution.

getCurrentLocalDateTimePicos :: City -> IO LocalDateTimePicos Source

Get the current local date and time with picosecond granularity from the system clock.

>>> getCurrentLocalDateTimePicos Karachi
2013-11-04 22:05:17.556043000000 PKT

Note that this functions calls gettimeofday behind the scenes. Therefore, the resultant timestamp will have picosecond granularity, but only microsecond resolution.

Time Zone Transition Times

newtype Transition Source

Time zone transition time.

Constructors

Transition 

Fields

unboxTrans :: LocalDateTime
 

Instances

getTransitions :: City -> IO [Transition] Source

Get a list of time zone transition times for the given city.

lastTransition :: (DateTime dt, Unix dt) => City -> dt -> IO (Maybe Transition) Source

Get the last time zone transition time for the given city and time.

Get Current Local Timestamps Using Preloaded Time Zone Transitions Times

getCurrentLocalDate' :: [Transition] -> IO LocalDate Source

Get the current local date from the system clock using preloaded transition times.

>>> ttimes <- getTransitions Tokyo 
>>> getCurrentLocalDate' ttimes
2013-11-04 JST

Use this function if you need to get the current local date more than once. The use of preloaded transition times will avoid unnecessary parsing of Olson files.

getCurrentLocalDateTime' :: [Transition] -> IO LocalDateTime Source

Get the current local date and time from the system clock using preloaded transition times.

>>> ttimes <- getTransitions Moscow
>>> getCurrentLocalDateTime' ttimes
2013-11-04 01:41:50 MSK

Use this function if you need to get the current local date and time more than once. The use of preloaded transition times will avoid unnecessary parsing of Olson files.

getCurrentLocalDateTimeMillis' :: [Transition] -> IO LocalDateTimeMillis Source

Get the current local date and time with millisecond granularity from the system clock using preloaded transition times.

>>> ttimes <- getTransitions Tehran
>>> getCurrentLocalDateTimeMillis' ttimes
2013-11-04 01:20:49.435 IRST

Use this function if you need to get the current local date and time with millisecond granularity more than once. The use of preloaded transition times will avoid unnecessary parsing of Olson files.

getCurrentLocalDateTimeMicros' :: [Transition] -> IO LocalDateTimeMicros Source

Get the current local date and time with microsecond granularity from the system clock using preloaded transition times.

>>> ttimes <- getTransitions Sao_Paulo
>>> getCurrentLocalDateTimeMicros' ttimes
2013-11-03 19:58:50.405806 BRST

Use this function if you need to get the current local date and time with microsecond granularity more than once. The use of preloaded transition times will avoid unnecessary parsing of Olson files.

getCurrentLocalDateTimeNanos' :: [Transition] -> IO LocalDateTimeNanos Source

Get the current local date and time with nanosecond granularity from the system clock using preloaded transition times.

>>> ttimes <- getTransitions Mogadishu
>>> getCurrentLocalDateTimeNanos' ttimes
2013-11-04 01:15:08.664426000 EAT

Use this function if you need to get the current local date and time with nanosecond granularity more than once. The use of preloaded transition times will avoid unnecessary parsing of Olson files.

Note that this functions calls gettimeofday behind the scenes. Therefore, the resultant timestamp will have nanosecond granularity, but only microsecond resolution.

getCurrentLocalDateTimePicos' :: [Transition] -> IO LocalDateTimePicos Source

Get the current local date and time with picosecond granularity from the system clock using preloaded transition times.

>>> ttimes <- getTransitions Baghdad
>>> getCurrentLocalDateTimePicos' ttimes
2013-11-04 01:20:57.502906000000 AST

Use this function if you need to get the current local date and time with picosecond granularity more than once. The use of preloaded transition times will avoid unnecessary parsing of Olson files.

Note that this functions calls gettimeofday behind the scenes. Therefore, the resultant timestamp will have picosecond granularity, but only microsecond resolution.

Pretty Local Timestamps

prettyLocalDate :: LocalDate -> String Source

Show a local date as a pretty string.

>>> prettyLocalDate $ createLocalDate 2014 September 25 Japan_Standard_Time 
"Thursday, September 25th, 2014 (JST)"

prettyLocalDateTime :: DateTimeZone dtz => dtz -> String Source

Show a local date and time as a pretty string.

>>> getCurrentLocalDateTime Los_Angeles >>= return . prettyLocalDateTime 
"2:17 AM, Wednesday, January 1st, 2014 (PST)"

Base Conversions

baseUnixToUTC :: Int64 -> Int64 Source

Convert Unix seconds into a UTC seconds.

baseUTCToUnix :: Int64 -> (Int64, Double) Source

Convert UTC seconds into Unix and leap seconds.