dateTime <- c('1984-02-28 13:56',
'1984-03-01 00:00',
'1986-03-01 00:00',
'1986-10-15 00:00')
decimalDate(dateTime)
dateTime <- c('1984-02-28',
'1984-03-01',
'1986-03-01',
'1986-10-15')
decimalDate(dateTime)
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