dates

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# dates: date and time utilities
Name | Type | Description
calendar | verb | calendar for year [months]
getdate | verb | get date from character string
isotimestamp | verb | format time stamps as: 2000-05-23 16:06:39.268
timestamp | verb | format time stamps as: 23 May 1998 16:06:39
todate | verb | converts day numbers to dates
todayno | verb | converts dates to day numbers
tsdiff | verb | differences between pairs of dates.
tsrep | verb | timestamp representation as a single number
valdate | verb | validate dates
weekday | verb | returns weekday from date, 0=Sunday ... 6=Saturday
calendar
    calendar for year [months]
    returns calendar for year, as a 12 element list

    argument is one or more numbers: year, months
    If no months are given, it defaults to all months.

    example:
       calendar 1998 5 6
    +---------------------+---------------------+
    |         May         |         Jun         |
    | Su Mo Tu We Th Fr Sa| Su Mo Tu We Th Fr Sa|
    |                 1  2|     1  2  3  4  5  6|
    |  3  4  5  6  7  8  9|  7  8  9 10 11 12 13|
    | 10 11 12 13 14 15 16| 14 15 16 17 18 19 20|
    | 17 18 19 20 21 22 23| 21 22 23 24 25 26 27|
    | 24 25 26 27 28 29 30| 28 29 30            |
    | 31                  |                     |
    +---------------------+---------------------+
getdate
    get date from character string
    form: [opt] getdate string

    useful for input forms that have a date entry field

    date forms permitted:
        1986 5 23
        May 23 1986
        23 May 1986
    and:
      opt=0  (days first - default)
        23 5 1986
      opt=1  (months first)
        5 23 1986

    other characters allowed:  ,-/:

    if not given, century defaults to current

    only first 3 characters of month are tested.

    examples:  23/5/86; may 23, 1986; 1986-5-23

    requires: valdate
isotimestamp
    format time stamps as:  2000-05-23 16:06:39.268
    y. is one or more time stamps in 6!:0 format
timestamp
    format time stamps as:  23 May 1998 16:06:39
    y. is time stamp, if empty default to current time
todate
    converts day numbers to dates
    converts day numbers to dates, converse <todayno>

    This conversion is exact and provides a means of
    performing exact date arithmetic.

    y. = day numbers
    x. = optional:
      0 - result in form <yyyy mm dd> (default)
      1 - result in form <yyyymmdd>

    example:
       todate 72460
    1998 5 23

       todate 0 1 2 3 + todayno 1992 2 27
    1992 2 27
    1992 2 28
    1992 2 29
    1992 3  1
todayno
    converts dates to day numbers
    converts dates to day numbers, converse <todate>

    y. = dates
    x. = optional:
      0 - dates in form <yyyy mm dd> (default)
      1 - dates in form <yyyymmdd>
    0 = todayno 1800 1 1, or earlier

    example:
       todayno 1998 5 23
    72460
tsdiff
    differences between pairs of dates.

    form:  end tsdiff begin
      end, begin are vectors or matrices in form YYYY MM DD
      end dates should be later than begin dates

    method is to subtract dates on a calendar basis to determine
    integral number of months plus the exact number of days remaining.
    This is converted to payment periods, where # days remaining are
    calculated as: (# days)%365

    example:
       1994 10 1 tsdiff 1986 5 23
    8.35799
tsrep
    timestamp representation as a single number

    form: [opt] timerep times
      opt=0  convert timestamps to numbers (default)
          1  convert numbers to timestamps

    timestamps are in 6!:0 format, or matrix of same.

    examples:
       tsrep 1800 1 1 0 0 0
    0
       ":!.13 tsrep 1995 5 23 10 24 57.24
    6165887097240
valdate
    validate dates
    form: valdate dates
    dates is 3-element vector
          or 3-column matrix
          in form YYYY MM DD
    returns 1 if valid
weekday
    returns weekday from date, 0=Sunday ... 6=Saturday
    arguments as for <todayno>, e.g.

        5 = weekday 1997 5 23 = 1 weekday 19970523
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