Module date 

Date and time conversion helpers.

Mirrors the logic in Go date.go, converting between Excel serial numbers and chrono naive date/time types while accounting for the 1900/1904 date system and the Excel 1900 leap-year bug.

Structs

Date

Convenience helper for date/time conversions used elsewhere in the crate.

Constants

EXCEL_BUGGY_PERIOD_START

Start of the period affected by the Excel 1900 leap-year bug (1900-03-01).

EXCEL_EPOCH_1900

Forward-conversion epoch for the 1900 date system (1899-12-31).

EXCEL_EPOCH_1904

Excel epoch for the 1904 date system (1904-01-01).

EXCEL_MIN_TIME_1900

Earliest representable date in the 1900 date system.

EXCEL_REVERSE_EPOCH_1900

Reverse-conversion epoch for the 1900 date system (1899-12-30).

Functions

date_to_excel_serial

Convert a NaiveDate to an Excel serial number.

datetime_to_excel_serial

Convert a NaiveDateTime to an Excel serial number.

excel_serial_to_datetime

Convert an Excel serial number to a NaiveDateTime.

format_year

Convert a 2-digit year into a 4-digit year using Excel’s 30/1900 rule.

get_days_in_month

Return the number of days in the given month.

is_leap_year

Determine whether a year is a leap year.

time_to_excel_serial

Convert a NaiveTime to the fractional part of an Excel day.

validate_date

Validate whether the given year, month and day form a legal date.