7.5.16.6 SRFI-19 String to date

Function: string->date input template

Convert an input string to a date under the control of a template string. Return a newly created date object.

Literal characters in template must match characters in input and ‘~’ escapes must match the input forms described in the table below. “Skip to” means characters up to one of the given type are ignored, or “no skip” for no skipping. “Read” is what’s then read, and “Set” is the field affected in the date object.

For example ‘~Y’ skips input characters until a digit is reached, at which point it expects a year and stores that to the year field of the date.

	Skip to	Read	Set
~~	no skip	literal ~	nothing
~a	char-alphabetic?	locale abbreviated weekday name	nothing
~A	char-alphabetic?	locale full weekday name	nothing
~b	char-alphabetic?	locale abbreviated month name	date-month
~B	char-alphabetic?	locale full month name	date-month
~d	char-numeric?	day of month	date-day
~e	no skip	day of month, blank padded	date-day
~h	same as ‘~b’
~H	char-numeric?	hour	date-hour
~k	no skip	hour, blank padded	date-hour
~m	char-numeric?	month	date-month
~M	char-numeric?	minute	date-minute
~N	char-numeric?	nanosecond	date-nanosecond
~S	char-numeric?	second	date-second
~y	no skip	2-digit year	date-year within 50 years
~Y	char-numeric?	year	date-year
~z	no skip	time zone	date-zone-offset

Notice that the weekday matching forms don’t affect the date object returned, instead the weekday will be derived from the day, month and year.

Conversion is locale-dependent on systems that support it (see Accessing Locale Information). See setlocale, for information on how to change the current locale.