Module Ptime.Span

The type for signed, picosecond precision, POSIX time spans.

v s is like of_d_ps s but raises Invalid_argument if s is not in the right range. Use of_d_ps to deal with untrusted input.

zero is the neutral element of add.

of_d_ps (d, ps) is a span for the signed POSIX picosecond span d * 86_400e12 + ps. d is a signed number of POSIX days and ps a number of picoseconds in the range [0;86_399_999_999_999_999L]. None is returned if ps is not in the right range.

to_d_ps d is the span d as a pair (d, ps) expressing the POSIX picosecond span d * 86_400e12 + ps with ps in the range [0;86_399_999_999_999_999L]

of_int_s secs is a span from the signed integer POSIX second span secs.

to_int_s d is the span d as a signed integer POSIX second span, if int's range can represent it (note that this depends on Sys.word_size). Subsecond precision numbers are truncated.

of_float_s secs is a span from the signed floating point POSIX second span d. Subpicosecond precision numbers are truncated.

None is returned if secs cannot be represented as a span. This occurs on Stdlib.nan or if the duration in POSIX days cannot fit on an int (on 32-bit platforms this means the absolute magnitude of the duration is greater than ~2'941'758 years).

to_float_s s is the span d as floating point POSIX seconds.

Warning. The magnitude of s may not be represented exactly by the floating point value.

equal d d' is true iff d and d' are the same time span.

compare d d' is a total order on durations that is compatible with signed time span order.

neg d is the span d negated.

add d d' is d + d'.

sub d d' is d - d'.

abs d is the absolute value of span d.

round ~frac_s t is t rounded to the frac_s decimal fractional second. Ties are rounded away from zero. frac_s is clipped to the range [0;12].

truncate ~frac_s t is t truncated to the frac_s decimal fractional second. frac_s is clipped to the range [0;12].

pp ppf d prints an unspecified, approximative, representation of d on ppf.

The representation is not fixed-width, depends on the magnitude of d and uses locale independent SI prefixes on seconds and accepted non-SI units. Years are counted in Julian years (365.25 SI-accepted days) as defined by the International Astronomical Union (IUA).

The representation is approximative. In particular beyond 60 seconds it only keeps the two most significant time units and rounds towards the infinity. The latter means that case arising, it always over approximates durations.

Warning Becomes unprecise (but does not overflow) if the absolute number of POSIX days in the time span is greater than max_int / 4 (on 32-bit platforms this is ~735'439 years)

dump ppf s prints an unspecified raw representation of d on ppf.