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 Time Units
dtt_adjust_tz           Adjust Time Zone
dtt_adjust_units        Adjust Units
dtt_aggregate           Aggregate Date/Time
dtt_complete            Complete
dtt_completed           Completed
dtt_date                Floor Date
dtt_date_add_time       Add Time to Date
dtt_date_from_ints      Create Dates from Integers
dtt_date_time           Floor Date/Time
dtt_date_time_from_ints
                        Create Date Times from Integers
dtt_day                 Get and Set Day Values
dtt_day_decimal         Get Decimal Day Values
dtt_days_in_month       Days in the Month
dtt_days_in_year        Days in the Year
dtt_dayte               Dayte
dtt_dayte_time          Dayte Time
dtt_daytt               Dayte Time
dtt_decade              Decade
dtt_diff                Time Difference
dtt_doy                 Day of the Year
dtt_doy_decimal         Day of the Year Decimal
dtt_doy_to_date         Day of the Year to Date
dtt_excel_to_date       Convert Excel dates to dates.
dtt_excel_to_date_time
                        Convert Excel date times to date times.
dtt_feb29_to_28         Convert Feb 29 to Feb 28
dtt_floor               Floor Date/Time
dtt_floored             Test Floored
dtt_hour_decimal        Get Decimal Hour Values
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_leap_year           Test for Leap Year
dtt_minute_decimal      Get Decimal Minute Values
dtt_minutes             Get and Set Minute Values
dtt_month_decimal       Get Decimal Month Values
dtt_months              Get and Set Month Values
dtt_season              Season
dtt_seconds             Get and Set Second Values
dtt_seq                 Sequence
dtt_set_time            Floor Time
dtt_set_tz              Set Time Zone
dtt_study_year          Study Year
dtt_subtract_units      Subtract Time Units
dtt_sys_date            Get System Date
dtt_sys_date_time       Get System Date Time
dtt_sys_time            Get System Time
dtt_sys_tz              Get, Set or Reset Default Time Zone
dtt_time_from_ints      Create Time from Vectors
dtt_tz                  Get, Set or Adjust Time Zone
dtt_units               Get Units
dtt_units_per_unit      Units per Unit
dtt_wday                Get Week Day
dtt_wrap                Wrap
dtt_year_decimal        Get Decimal Year Values
dtt_years               Get and Set Year Values
is_date_time            Is Date/Time
vld_time                Validate Time
