Source code for gdt.missions.swift.time

# CONTAINS TECHNICAL DATA/COMPUTER SOFTWARE DELIVERED TO THE U.S. GOVERNMENT
# WITH UNLIMITED RIGHTS
#
# Grant No.: 80NSSC21K0651
# Grantee Name: Universities Space Research Association
# Grantee Address: 425 3rd Street SW, Suite 950, Washington DC 20024
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# Copyright 2024 by Universities Space Research Association (USRA). All rights
# reserved.
#
# Developed by: Corinne Fletcher
#               Universities Space Research Association
#               Science and Technology Institute
#               https://sti.usra.edu
#
# This work is a derivative of the Gamma-ray Data Tools (GDT), including the
# Core and Fermi packages, originally developed by the following:
#
#     William Cleveland and Adam Goldstein
#     Universities Space Research Association
#     Science and Technology Institute
#     https://sti.usra.edu
#
#     Daniel Kocevski
#     National Aeronautics and Space Administration (NASA)
#     Marshall Space Flight Center
#     Astrophysics Branch (ST-12)
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
#

import datetime
import re

import erfa
import numpy as np
from astropy.time import TimeFromEpoch, TimeUnique, ScaleValueError, Time
from astropy.time.utils import day_frac

__all__ = ['SwiftSecTime', 'Time']

class SwiftSecTime(TimeFromEpoch):
    """Represents the number of seconds elapsed since Jan 1, 2001, 00:00:00 UTC,
    including leap seconds
    """
    name = 'swift'
    """(str): Name of the mission"""

    unit = 1.0 / 86400
    """(float): unit in days"""

    epoch_val = '2001-01-01 00:01:04.184'
    """(str): The epoch in Terrestrial Time"""

    epoch_val2 = None

    epoch_scale = 'tt'
    """(str): The scale of :attr:`epoch_val`"""

    epoch_format = 'iso'
    """(str): Format of :attr:`epoch_val`"""