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Type:
Improvement
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Aggregation Framework
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Labels:None
Observed behavior: The documentation says that $week will be 0 for days before the first sunday of the year. However, if the first day of the year is a sunday $week is implemented to be 0 for days before the second sunday of the year.
Expected behavior: $week is 0 for days before the first sunday of the year, as described in the documentation.
Test:
c = db.c; c.drop(); // Sunday Jan 1 1984 sun = new Date( 1984, 0, 1 ); assert.eq( 1984, sun.getFullYear() ); assert.eq( 0, sun.getMonth() ); assert.eq( 1, sun.getDate() ); assert.eq( 0, sun.getDay() ); // Monday Jan 2 1984 mon = new Date( 1984, 0, 2 ); assert.eq( 1984, mon.getFullYear() ); assert.eq( 0, mon.getMonth() ); assert.eq( 2, mon.getDate() ); assert.eq( 1, mon.getDay() ); c.save( {} ); // These dates are not before the first sunday of the year and are expected to be in week 1. assert.eq( 1, c.aggregate( { $project:{ a:{ $week:[ sun ] } } } ).result[ 0 ].a ); assert.eq( 1, c.aggregate( { $project:{ a:{ $week:[ mon ] } } } ).result[ 0 ].a );