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measures.epoch - Function

	Package	general
	Module	measures
	Tool	measures

define an epoch measure

Synopsis
epoch(rf, v0, off)

Arguments

rf	in	reference code
		Allowed:	coded string
v0	in	epoch value
		Allowed:	time quantity
		Default:	0.0d
off	in	optional offset
		Allowed:	epoch measure
		Default:	F

Returns
epoch measure

Description
epoch defines an epoch measure from the CLI. It has to specify a reference code, an epoch quantity value (see introduction for the action on a scalar quantity with either a vector or scalar value, and when a vector of quantities is given), and optionally it can specify an offset, which in itself has to be an epoch. Allowable reference codes are: UTC TAI LAST LMST GMST1 GAST UT1 UT2 TDT TCG TDB TCB.
Note that additional ones may become available. Check in Glish with:

- dm.listcodes(dm.epoch())
[normal=LAST LMST GMST1 GAST UT1 UT2 UTC TAI TDT TCG TDB TCB IAT
        GMST TT ET UT, extra=]

See quantity for possible time formats.

Example

- dm.epoch('utc','today') 
[type=epoch, refer=utc, m0=[value=50451, unit=d]]