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ut.coffee

Universal Time Creator

 
             		           
                               
                            
                                
               
These regular expressions were borrowed
from a smart source.
             		                            
iso8601Offset = /[-+]\d{2}:\d{2}$/
iso8601Format = /^(\d{4})-(\d{2})-(\d{2})((([T ](\d{2}):(\d{2})(:(\d{2})(\.(\d+))?)?)?)?)?(([-+])(\d{2}):(\d{2}))?(Z)?$/
             		           
                               
                            
                                
               
Checks if a string is in ISO-8601 format.
             		                            
exports.isoMatchFormat = (iso) ->
  iso.match iso8601Format
             		           
                               
                            
                                
               
Checks if a string ends with ISO-8601 time offset.
             		                            
exports.isoMatchOffset = (iso) ->
  iso.match iso8601Offset
             		           
                               
                            
                                
               
Expects UTC time as ISO-8601 String, or defaults to Date.now();
Converts utc to the equivalent universal time pieces
that utc_to_jd (the swiss ephemeris function) expects.
Ready for calling precious with.
             		                            
exports.c = (utc = (new Date Date.now()).toISOString()) ->
  t = utc.match(iso8601Format)
  seconds = t[10] || 0 # optional
  seconds+= ".#{t[12]}" if t[12]? # floating point precise
  return [ Number(t[1])
         , Number(t[2])
         , Number(t[3])
         , Number(t[7])
         , Number(t[8])
         , Number(seconds)
         , 1 # Gregorian flag - correct?
         ]
             		           
                               
                            
                                
               
Node gets the getUTCMonth() wrong (-1), so don't trust it:



time = new Date utc
[ time.getUTCFullYear()
, time.getUTCMonth()
, time.getUTCDate()
, time.getUTCHours()
, time.getUTCMinutes()
, "#{time.getUTCSeconds()}.#{time.getUTCMilliseconds()}"
]




TODO: ask the author of DateExtensions.js (the regex) why he also subtracts 1 from month.
Is it about a v8 / node.js issue?