astCurrentTimeastCurrentTime
-
Return the current system time
- Description:
- This function
returns the current system time, represented in the form specified
by the supplied TimeFrameTimeFrame. That is, the returned floating point
value should be interpreted using the attribute values of the
TimeFrame. This includes SystemSystem, TimeOriginTimeOrigin, LTOffsetLTOffset, TimeScaleTimeScale,
and Unit.
- Synopsis:
- double astCurrentTime( AstTimeFrame
this )
- Parameters:
-
this
-
Pointer to the TimeFrame.
- Returned Value:
-
astCurrentTime()
-
A TimeFrame axis value representing the current system time.
- Notes:
- Values of AST__BAD will be returned if this function is
invoked with the AST error status set, or if it should fail for
any reason.
- It is assumes that the system time (returned by the C time()
function) follows the POSIX standard, representing a continuous
monotonic increasing count of SI seconds since the epoch 00:00:00
UTC 1 January 1970 AD (equivalent to TAI with a constant offset).
Resolution is one second.
- An error will be reported if the TimeFrame has a TimeScale value
which cannot be converted to TAI (e.g. "angular" systems such as
UT1, GMST, LMST and LAST).
- Any inaccuracy in the system clock will be reflected in the value
returned by this function.