NA_Date_                Missing Date
NA_POSIXct_             Missing POSIXct
NA_hms_                 Missing hms
check_tz                Check Time Zone
chk_time                Check Time
dtt                     dtt Object
dtt_add_units           Add Units
dtt_adjust_tz           Adjust Time Zone
dtt_adjust_units        Adjust Units
dtt_aggregate           Aggregates
dtt_complete            Complete
dtt_completed           Completed
dtt_date                Date
dtt_date_time           Date Time
dtt_day                 Get and Set Day Values
dtt_dayte               Dayte
dtt_dayte_time          Dayte Time
dtt_daytt               Dayte Time
dtt_doy                 Day of the Year
dtt_doy_to_date         Day of the Year to Date
dtt_feb29_to_28         Feb 29 to Feb 28
dtt_floor               Floor
dtt_floored             Floored
dtt_hours               Get and Set Hour Values
dtt_is_date             Is Date
dtt_is_date_time        Is Date Time
dtt_is_dtt              Is Date or DateTime Object
dtt_minutes             Get and Set Minute Values
dtt_months              Get and Set Month Values
dtt_season              Season
dtt_seconds             Get and Set Second Values
dtt_seq                 Sequence
dtt_set_tz              Set Time Zone
dtt_study_year          Study Year
dtt_subtract_units      Subtract Units
dtt_sys_tz              Get, Set or Reset Default Time Zone
dtt_time                Time
dtt_tz                  Get, Set or Adjust Time Zone
dtt_units               Get Units
dtt_units_per_unit      Units per Unit
dtt_wrap                Wrap
dtt_years               Get and Set Year Values
is.datetime             Is Date/Time
vld_time                Validate Time
