# 'use strict'


# ############################################################################################################
# ### https://day.js.org ###
# H                                   = require './_helpers'
# @_dayjs                             = require 'dayjs'
# @_timestamp_input_template          = 'YYYYMMDD-HHmmssZ'
# @_timestamp_output_template         = 'YYYYMMDD-HHmmss[Z]'
# defaults                            = {}

# #===========================================================================================================
# do =>
#   utc               = require 'dayjs/plugin/utc';               @_dayjs.extend utc
#   relativeTime      = require 'dayjs/plugin/relativeTime';      @_dayjs.extend relativeTime
#   toObject          = require 'dayjs/plugin/toObject';          @_dayjs.extend toObject
#   customParseFormat = require 'dayjs/plugin/customParseFormat'; @_dayjs.extend customParseFormat
#   duration          = require 'dayjs/plugin/duration';          @_dayjs.extend duration

# #===========================================================================================================
# H.types.declare 'guy_dt_valid_dayjs', tests:
#   "( @type_of x ) is 'm'":  ( x ) -> ( @type_of x ) is 'm'
#   "@isa.float x.$y":        ( x ) -> @isa.float x.$y
#   "@isa.float x.$M":        ( x ) -> @isa.float x.$M
#   "@isa.float x.$D":        ( x ) -> @isa.float x.$D
#   "@isa.float x.$W":        ( x ) -> @isa.float x.$W
#   "@isa.float x.$H":        ( x ) -> @isa.float x.$H
#   "@isa.float x.$m":        ( x ) -> @isa.float x.$m
#   "@isa.float x.$s":        ( x ) -> @isa.float x.$s
#   "@isa.float x.$ms":       ( x ) -> @isa.float x.$ms

# #-----------------------------------------------------------------------------------------------------------
# H.types.declare 'guy_dt_timestamp', tests:
#   "@isa.text x":                    ( x ) -> @isa.text x
#   "( /^\\d{8}-\\d{6}Z$/ ).test x":  ( x ) -> ( /^\d{8}-\d{6}Z$/ ).test x

# #-----------------------------------------------------------------------------------------------------------
# H.types.declare 'guy_dt_now_cfg', tests:
#   "@isa.object x":                    ( x ) -> @isa.object x
# defaults.guy_dt_now_cfg =
#     subtract:       null
#     add:            null


# #===========================================================================================================
# # DATETIME
# #-----------------------------------------------------------------------------------------------------------
# @from_now = ( srts ) ->
#   return ( @parse srts ).fromNow()

# #-----------------------------------------------------------------------------------------------------------
# @now = ( cfg ) ->
#   H.types.validate.guy_dt_now_cfg ( cfg = { defaults.guy_dt_now_cfg..., cfg..., } )
#   R = @_dayjs().utc()
#   R = R.subtract cfg.subtract...  if cfg.subtract?
#   R = R.add      cfg.add...       if cfg.add?
#   return R.format @_timestamp_output_template

# #-----------------------------------------------------------------------------------------------------------
# @srts_from_isots = ( isots ) -> ( @_dayjs isots ).utc().format @_timestamp_output_template

# #-----------------------------------------------------------------------------------------------------------
# @parse = ( srts ) ->
#   H.types.validate.guy_dt_timestamp srts
#   R = ( @_dayjs srts, @_timestamp_input_template ).utc()
#   throw new Error "^guy.datetime.dt_parse@1^ #{rpr srts}" unless H.types.isa.guy_dt_valid_dayjs R
#   return R

# #-----------------------------------------------------------------------------------------------------------
# @format = ( srts, P... ) ->
#   R = @parse srts
#   return R.format P...

# #-----------------------------------------------------------------------------------------------------------
# @isots_from_srts = ( srts ) -> ( @parse srts ).format()