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Merge pull request #5024 from flyx/timesimprovement

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Improvements to times.nim
This commit is contained in:
Andreas Rumpf
2016-11-15 09:32:48 +01:00
committed by GitHub
parent ff628e242f 0ffd14e169
commit c629d6fef1
2 changed files with 89 additions and 42 deletions
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104
lib/pure/times.nim
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@@ -144,8 +144,9 @@ type
yearday*: range[0..365] ## The number of days since January 1,
## in the range 0 to 365.
## Always 0 if the target is JS.
isDST*: bool ## Determines whether DST is in effect. Always
## ``False`` if time is UTC.
isDST*: bool ## Determines whether DST is in effect.
## Semantically, this adds another negative hour
## offset to the time in addition to the timezone.
timezone*: int ## The offset of the (non-DST) timezone in seconds
## west of UTC. Note that the sign of this number
## is the opposite of the one in a formatted
@@ -278,16 +279,20 @@ proc `+`*(ti1, ti2: TimeInterval): TimeInterval =
carryO = `div`(ti1.months + ti2.months, 12)
result.years = carryO + ti1.years + ti2.years
proc `-`*(ti: TimeInterval): TimeInterval =
result = TimeInterval(
milliseconds: -ti.milliseconds,
seconds: -ti.seconds,
minutes: -ti.minutes,
hours: -ti.hours,
days: -ti.days,
months: -ti.months,
years: -ti.years
)
proc `-`*(ti1, ti2: TimeInterval): TimeInterval =
## Subtracts TimeInterval ``ti1`` from ``ti2``.
result = ti1
result.milliseconds -= ti2.milliseconds
result.seconds -= ti2.seconds
result.minutes -= ti2.minutes
result.hours -= ti2.hours
result.days -= ti2.days
result.months -= ti2.months
result.years -= ti2.years
result = ti1 + (-ti2)
proc isLeapYear*(year: int): bool =
## returns true if ``year`` is a leap year
@@ -363,16 +368,9 @@ proc `-`*(a: TimeInfo, interval: TimeInterval): TimeInfo =
##
## **Note:** This has been only briefly tested, it is inaccurate especially
## when you subtract so much that you reach the Julian calendar.
let t = toSeconds(toTime(a))
var intval: TimeInterval
intval.milliseconds = - interval.milliseconds
intval.seconds = - interval.seconds
intval.minutes = - interval.minutes
intval.hours = - interval.hours
intval.days = - interval.days
intval.months = - interval.months
intval.years = - interval.years
let secs = toSeconds(a, intval)
let
t = toSeconds(toTime(a))
secs = toSeconds(a, -interval)
if a.timezone == 0:
result = getGMTime(fromSeconds(t + secs))
else:
@@ -824,28 +822,32 @@ proc formatToken(info: TimeInfo, token: string, buf: var string) =
if fyear.len != 5: fyear = repeat('0', 5-fyear.len()) & fyear
buf.add(fyear)
of "z":
let hours = abs(info.timezone) div secondsInHour
if info.timezone <= 0: buf.add('+')
let
nonDstTz = info.timezone - int(info.isDst) * secondsInHour
hours = abs(nonDstTz) div secondsInHour
if nonDstTz <= 0: buf.add('+')
else: buf.add('-')
buf.add($hours)
of "zz":
let hours = abs(info.timezone) div secondsInHour
if info.timezone <= 0: buf.add('+')
let
nonDstTz = info.timezone - int(info.isDst) * secondsInHour
hours = abs(nonDstTz) div secondsInHour
if nonDstTz <= 0: buf.add('+')
else: buf.add('-')
if hours < 10: buf.add('0')
buf.add($hours)
of "zzz":
let
hours = abs(info.timezone) div secondsInHour
minutes = (abs(info.timezone) div secondsInMin) mod minutesInHour
if info.timezone <= 0: buf.add('+')
nonDstTz = info.timezone - int(info.isDst) * secondsInHour
hours = abs(nonDstTz) div secondsInHour
minutes = (abs(nonDstTz) div secondsInMin) mod minutesInHour
if nonDstTz <= 0: buf.add('+')
else: buf.add('-')
if hours < 10: buf.add('0')
buf.add($hours)
buf.add(':')
if minutes < 10: buf.add('0')
buf.add($minutes)
of "":
discard
else:
@@ -1000,7 +1002,6 @@ proc parseToken(info: var TimeInfo; token, value: string; j: var int) =
of "M":
var pd = parseInt(value[j..j+1], sv)
info.month = Month(sv-1)
info.monthday = sv
j += pd
of "MM":
var month = value[j..j+1].parseInt()
@@ -1089,27 +1090,42 @@ proc parseToken(info: var TimeInfo; token, value: string; j: var int) =
info.year = value[j..j+3].parseInt()
j += 4
of "z":
info.isDST = false
if value[j] == '+':
info.timezone = 0 - parseInt($value[j+1]) * secondsInHour
elif value[j] == '-':
info.timezone = parseInt($value[j+1]) * secondsInHour
elif value[j] == 'Z':
info.timezone = 0
j += 1
return
else:
raise newException(ValueError,
"Couldn't parse timezone offset (z), got: " & value[j])
j += 2
of "zz":
info.isDST = false
if value[j] == '+':
info.timezone = 0 - value[j+1..j+2].parseInt() * secondsInHour
elif value[j] == '-':
info.timezone = value[j+1..j+2].parseInt() * secondsInHour
elif value[j] == 'Z':
info.timezone = 0
j += 1
return
else:
raise newException(ValueError,
"Couldn't parse timezone offset (zz), got: " & value[j])
j += 3
of "zzz":
info.isDST = false
var factor = 0
if value[j] == '+': factor = -1
elif value[j] == '-': factor = 1
elif value[j] == 'Z':
info.timezone = 0
j += 1
return
else:
raise newException(ValueError,
"Couldn't parse timezone offset (zzz), got: " & value[j])
@@ -1122,8 +1138,11 @@ proc parseToken(info: var TimeInfo; token, value: string; j: var int) =
j += token.len
proc parse*(value, layout: string): TimeInfo =
## This function parses a date/time string using the standard format identifiers (below)
## The function defaults information not provided in the format string from the running program (timezone, month, year, etc)
## This function parses a date/time string using the standard format
## identifiers as listed below. The function defaults information not provided
## in the format string from the running program (timezone, month, year, etc).
## Daylight saving time is only set if no timezone is given and the given date
## lies within the DST period of the current locale.
##
## ========== ================================================================================= ================================================
## Specifier Description Example
@@ -1148,7 +1167,7 @@ proc parse*(value, layout: string): TimeInfo =
## tt Same as above, but ``AM`` and ``PM`` instead of ``A`` and ``P`` respectively.
## yy Displays the year to two digits. ``2012 -> 12``
## yyyy Displays the year to four digits. ``2012 -> 2012``
## z Displays the timezone offset from UTC. ``GMT+7 -> +7``, ``GMT-5 -> -5``
## z Displays the timezone offset from UTC. ``Z`` is parsed as ``+0`` ``GMT+7 -> +7``, ``GMT-5 -> -5``
## zz Same as above but with leading 0. ``GMT+7 -> +07``, ``GMT-5 -> -05``
## zzz Same as above but with ``:mm`` where *mm* represents minutes. ``GMT+7 -> +07:00``, ``GMT-5 -> -05:00``
## ========== ================================================================================= ================================================
@@ -1166,6 +1185,8 @@ proc parse*(value, layout: string): TimeInfo =
info.hour = 0
info.minute = 0
info.second = 0
info.isDST = true # using this is flag for checking whether a timezone has \
# been read (because DST is always false when a tz is parsed)
while true:
case layout[i]
of ' ', '-', '/', ':', '\'', '\0', '(', ')', '[', ']', ',':
@@ -1195,16 +1216,17 @@ proc parse*(value, layout: string): TimeInfo =
parseToken(info, token, value, j)
token = ""
# We are going to process the date to find out if we are in DST, because the
# default based on the current time may be wrong. Calling getLocalTime will
# set this correctly, but the actual time may be offset from when we called
# toTime with a possibly incorrect DST setting, so we are only going to take
# the isDST from this result.
let correctDST = getLocalTime(toTime(info))
info.isDST = correctDST.isDST
if info.isDST:
# means that no timezone has been parsed. In this case, we need to check
# whether the date is within DST of the local time.
let tmp = getLocalTime(toTime(info))
# correctly set isDST so that the following step works on the correct time
info.isDST = tmp.isDST
# Now we process it again with the correct isDST to correct things like
# weekday and yearday.
# Correct weekday and yearday; transform timestamp to local time.
# There currently is no way of returning this with the original (parsed)
# timezone while also setting weekday and yearday (we are depending on stdlib
# to provide this calculation).
return getLocalTime(toTime(info))
# Leap year calculations are adapted from: