# every release
 - update documentation: README, vignettes, package doc
 - update hyperlinks (to e.g. latest CF version)

# 1.5
 - serialize() for writing
 - Climatology
 - `standard` calendar to use mixed gregorian/julian calendars
 - Paleocalendar
 - equidistant by element and calendar
 - create CFtime from POSIXct or Date, reference to 1970-01-01 00:00:00

# Further away
 - cut() needs to support "2 days" etc
 - filter() like tidyverse -> CFsubset
 - CFfactor() can use epochs with lower resolution such as [year, month] for 3-hr data: e.g. daily avg per month per epoch
 - Epoch factor periods should have climatological CFtime
