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DM-29059: Be more defensive in calculating time of observation #294

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DM-29059: Be more defensive in calculating time of observation #294

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8 changes: 6 additions & 2 deletions python/lsst/obs/lsst/translators/lsst.py
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Original file line number Diff line number Diff line change
Expand Up @@ -456,8 +456,12 @@ def to_location(self):
@cache_translation
def to_datetime_begin(self):
# Docstring will be inherited. Property defined in properties.py
self._used_these_cards("MJD-OBS")
return Time(self._header["MJD-OBS"], scale="tai", format="mjd")
# We prefer to use MJD-OBS but it seems that this can be missing
# and so we fall back to DATE-OBS
if self.is_key_ok("MJD-OBS"):
self._used_these_cards("MJD-OBS")
return Time(self._header["MJD-OBS"], scale="tai", format="mjd")
return super().to_datetime_begin()

@cache_translation
def to_datetime_end(self):
Expand Down