ΔT with its band and provenance: this model, "iers-utc/1" (docs/time.md), or a caller's pin, whose sigma, table and tableDigest are null.
1-σ band in seconds; null for a pin.
Date of the last observed IERS day behind the table; null for a pin.
The table's digest (DELTA_T_TABLE's, or the UT1 table's); null for a pin.
ΔT with its band and provenance: this model, "iers-utc/1" (docs/time.md), or a caller's pin, whose sigma, table and tableDigest are null.