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INTERFACE cf_stdtime.mli
Copyright (c) 2003-2006, James H. Woodyatt
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(** Conversions between Standard Time, UTC and TAI. *)
(** {6 Overview} *)
(** This module contains a type for representing values of standard time,
defined as a reference from Coordinated Universal Time (UTC). It also
provides functions for converting values of standard time to and from
TAI64 values (see {!Cf_tai64}).
{b Note:} no facility is yet provided here for manipulating time with
associated timezone attributes. Converting arbitrary values of UTC time
to and from local time is tricky, since daylight savings time rules vary
greatly from locality to locality and also over time.
{b Warning!} The International Earth Rotation and Reference System Service
determines whether and when to insert or delete leap seconds into the UTC
timescale. These announcements are made every six months in an IERS
bulletin. The current implementation contains a hard-coded table of leap
seconds that was accurate at least until Jan 1, 2007.
*)
(** {6 Types} *)
(** A record with field for each component of a standard time value. *)
type t = {
year: int; (** -2937947 .. 2941664, 1 BC == 0 *)
month: int; (** january=1 .. december=12 *)
day: int; (** 1 .. 31 *)
hour: int; (** 0 .. 23 *)
minute: int; (** 0 .. 59 *)
second: int; (** 0 .. 60, 60=leap second *)
}
(** {6 Functions} *)
(** Convert from TAI64 to UTC time. Use [utc_of_tai64 ~wday ~yday tai] to
obtain a UTC standard time record corresponding to the TAI time index
[tai]. Optionally, if ~wday and/or ~yday are provided, this function
stores the day of the week (0=sunday,6=saturday) in [wday] and the day of
year (1..366) in [yday].
*)
val utc_of_tai64: ?wday:int ref -> ?yday:int ref -> Cf_tai64.t -> t
(** Convert from UTC time to TAI64. Use [utc ~year ~month ~day ~hour ~minute
~sec] to obtain a TAI64 value corresponding to the UTC standard time
specified by the [~year ~month ~day ~hour ~minute ~sec] arguments. Raises
[Invalid_argument] if the time specified is not a valid UTC time value.
*)
val utc_to_tai64:
year:int -> month:int -> day:int -> hour:int -> minute:int ->
second:int -> Cf_tai64.t
(** This is the same as [utc_to_tai64], except it assumes the input is a valid
UTC time value. If it isn't, then the result is undefined.
*)
val utc_to_tai64_unsafe:
year:int -> month:int -> day:int -> hour:int -> minute:int ->
second:int -> Cf_tai64.t
(*--- End of File [ cf_stdtime.mli ] ---*)
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