JulianFields.ModifiedJulianDay Property

  • Reference

Definition

Namespace:
Java.Time.Temporal
Assembly:
Mono.Android.dll

Modified Julian Day field.

[Android.Runtime.Register("MODIFIED_JULIAN_DAY", ApiSince=26)]
public static Java.Time.Temporal.ITemporalField? ModifiedJulianDay { get; }
[<Android.Runtime.Register("MODIFIED_JULIAN_DAY", ApiSince=26)>]
static member ModifiedJulianDay : Java.Time.Temporal.ITemporalField

Property Value

ITemporalField
Attributes
RegisterAttribute

Remarks

Modified Julian Day field.

This is an integer-based version of the Modified Julian Day Number. Modified Julian Day (MJD) is a well-known system that counts days continuously. It is defined relative to astronomical Julian Day as MJD = JD - 2400000.5. Each Modified Julian Day runs from midnight to midnight. The field always refers to the local date-time, ignoring the offset or zone.

For date-times, 'MODIFIED_JULIAN_DAY.getFrom()' assumes the same value from midnight until just before the next midnight. When 'MODIFIED_JULIAN_DAY.adjustInto()' is applied to a date-time, the time of day portion remains unaltered. 'MODIFIED_JULIAN_DAY.adjustInto()' and 'MODIFIED_JULIAN_DAY.getFrom()' only apply to Temporal objects that can be converted into ChronoField#EPOCH_DAY. An UnsupportedTemporalTypeException is thrown for any other type of object.

This implementation is an integer version of MJD with the decimal part rounded to floor.

In the resolving phase of parsing, a date can be created from a Modified Julian Day field. In ResolverStyle#STRICT strict mode and ResolverStyle#SMART smart mode the Modified Julian Day value is validated against the range of valid values. In ResolverStyle#LENIENT lenient mode no validation occurs.

<h4>Astronomical and Scientific Notes</h4>

| ISO date          | Modified Julian Day |      Decimal MJD |
             | 1970-01-01T00:00  |             40,587  |       40,587.0   |
             | 1970-01-01T06:00  |             40,587  |       40,587.25  |
             | 1970-01-01T12:00  |             40,587  |       40,587.5   |
             | 1970-01-01T18:00  |             40,587  |       40,587.75  |
             | 1970-01-02T00:00  |             40,588  |       40,588.0   |
             | 1970-01-02T06:00  |             40,588  |       40,588.25  |
             | 1970-01-02T12:00  |             40,588  |       40,588.5   |

Modified Julian Days are sometimes taken to imply Universal Time or UTC, but this implementation always uses the Modified Julian Day for the local date, regardless of the offset or time-zone.

Java documentation for java.time.temporal.JulianFields.MODIFIED_JULIAN_DAY.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Applies to