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Module Zone

module Zone: Zone

User-friendly interface


type t
The type of a time-zone.

bin_io and sexp representations of Zone.t are the name of the zone, and not the full data that is read from disk when Zone.find is called. The full Zone.t is reconstructed on the receiving/reading side by reloading the zone file from disk. Any zone name that is accepted by find is acceptable in the bin_io and sexp representations.

include Stringable
val find : string -> t option
find name looks up a t by its name and returns it.
val find_office : [ `chi | `hkg | `ldn | `nyc ] -> t
find_office office a more type-safe interface for pulling timezones related to existing Jane Street offices/locations.
val find_exn : string -> t
val machine_zone : ?refresh:bool -> unit -> t
machine_zone ?refresh () returns the machines zone (t). It does this by first looking for a value in the environment variable "TZ", and loading the named zone if it is set. If "TZ" is not set it reads /etc/localtime directly.

The first call to machine_zone is cached, so there is no need to cache it locally. The cache can be bypassed and refreshed by setting ~refresh to true.

Note that this function can throw an exception if the TZ time variable is misconfigured or if the appropriate timezone files can't be found because of the way the box is configured. We don't put an _exn on this function because that misconfiguration is quite rare.

val likely_machine_zones : string list Pervasives.ref
likely_machine_zones is a list of zone names that will be searched first when trying to determine the machine zone of a box. Setting this to a likely set of zones for your application will speed the very first call to machine_zone
val of_utc_offset : hours:int -> t
of_utc_offset offset returns a timezone with a static UTC offset (given in hours).
val default_utc_offset_deprecated : t -> int
default_utc_offset returns the UTC offset of default regime for timezone t in seconds. Note: the default utc offset may not reflect the current utc offset.
val utc : t
utc the UTC time zone. Included for convenience
val abbreviation : t -> float -> string
abbreviation zone t returns t abbreviation name such as EDT, EST, JST of given zone at the time t. This string conversion is one-way only, and cannot reliably be turned back into a t
val name : t -> string
name zone returns the name of the time zone
val init : unit -> unit
init () pre-load all available time zones from disk, this function has no effect if it is called multiple times. Time zones will otherwise be loaded at need from the disk on the first call to find/find_exn.
val digest : t -> string option
digest t return the MD5 digest of the file the t was created from (if any)
val initialized_zones : unit -> (string * t) list
initialized_zones () returns a sorted list of time zone names that have been loaded from disk thus far.
val shift_epoch_time : t -> [ `Local | `UTC ] -> float -> float
shift_epoch_time zone [`Local | `UTC] time Takes an epoch (aka "unix") time given either in local or in UTC (as indicated in the arguments) and shifts it according to the local time regime in force in zone. That is, given a Local epoch time it will return the corresponding UTC timestamp and vice versa. This function is low level, and is not intended to be called by most client code. Use the high level functions provided in Time instead.
val pp : Format.formatter -> t -> unit
exception Unknown_zone of string
exception Invalid_file_format of string
module Stable: sig .. end
val t_of_sexp : Sexplib.Sexp.t -> t
val sexp_of_t : t -> Sexplib.Sexp.t
val bin_t : t Bin_prot.Type_class.t
val bin_read_t : t Bin_prot.Read_ml.reader
val bin_read_t_ : t Bin_prot.Unsafe_read_c.reader
val bin_read_t__ : (int -> t) Bin_prot.Unsafe_read_c.reader
val bin_reader_t : t Bin_prot.Type_class.reader
val bin_size_t : t Bin_prot.Size.sizer
val bin_write_t : t Bin_prot.Write_ml.writer
val bin_write_t_ : t Bin_prot.Unsafe_write_c.writer
val bin_writer_t : t Bin_prot.Type_class.writer