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[doc] Time class document updated.

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Tanaka Akira 2025-02-22 10:29:37 +09:00
parent 4963d393ca
commit b17f984e4e
1 changed files with 14 additions and 9 deletions
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timev.rb
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@ -47,25 +47,30 @@
#
# == \Time Internal Representation
#
# Time implementation uses a signed 63 bit integer, Integer, or
# Rational.
# It is a number of nanoseconds since the _Epoch_.
# Conceptually, Time class uses a Rational value to represent the number of
# nanoseconds from _Epoch_, 1970-01-01 00:00:00 UTC.
# There are no boundary or resolution limitations.
# The value can be obtaind using Time#to_r.
#
# The Time class always uses the Gregorian calendar.
# I.e. the proleptic Gregorian calendar is used.
# Other calendars, such as Julian calendar, are not supported.
#
# The implementation uses a signed 63 bit integer or Integer (Bignum) to
# represent the Rational values if possible.
# (The signed 63 bit integers are used regardless of 32 and 64 bit environments.)
# The signed 63 bit integer can represent 1823-11-12 to 2116-02-20.
# When Integer or Rational is used (before 1823, after 2116, under
# nanosecond), Time works slower than when the signed 63 bit integer is used.
#
# Ruby uses the C function +localtime+ and +gmtime+ to map between the number
# and 6-tuple (year,month,day,hour,minute,second).
# +localtime+ is used for local time and "gmtime" is used for UTC.
# +localtime+ is used for local time and +gmtime+ is used for UTC.
#
# Integer and Rational has no range limit, but the localtime and
# gmtime has range limits due to the C types +time_t+ and <tt>struct tm</tt>.
# If that limit is exceeded, Ruby extrapolates the localtime function.
#
# The Time class always uses the Gregorian calendar.
# I.e. the proleptic Gregorian calendar is used.
# Other calendars, such as Julian calendar, are not supported.
#
# +time_t+ can represent 1901-12-14 to 2038-01-19 if it is 32 bit signed integer,
# -292277022657-01-27 to 292277026596-12-05 if it is 64 bit signed integer.
# However +localtime+ on some platforms doesn't supports negative +time_t+ (before 1970).
@ -73,7 +78,7 @@
# <tt>struct tm</tt> has _tm_year_ member to represent years.
# (<tt>tm_year = 0</tt> means the year 1900.)
# It is defined as +int+ in the C standard.
# _tm_year_ can represent between -2147481748 to 2147485547 if +int+ is 32 bit.
# _tm_year_ can represent years between -2147481748 to 2147485547 if +int+ is 32 bit.
#
# Ruby supports leap seconds as far as if the C function +localtime+ and
# +gmtime+ supports it.