tar: Day of week items

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1 7.6 Day of week items
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1 The explicit mention of a day of the week will forward the date (only if
1 necessary) to reach that day of the week in the future.
1 
1    Days of the week may be spelled out in full: 'Sunday', 'Monday',
1 'Tuesday', 'Wednesday', 'Thursday', 'Friday' or 'Saturday'.  Days may be
1 abbreviated to their first three letters, optionally followed by a
1 period.  The special abbreviations 'Tues' for 'Tuesday', 'Wednes' for
1 'Wednesday' and 'Thur' or 'Thurs' for 'Thursday' are also allowed.
1 
1    A number may precede a day of the week item to move forward
1 supplementary weeks.  It is best used in expression like 'third monday'.
1 In this context, 'last DAY' or 'next DAY' is also acceptable; they move
1 one week before or after the day that DAY by itself would represent.
1 
1    A comma following a day of the week item is ignored.
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