to-date-string: add about in ReadMe file

README.md

@@ -7,10 +7,45 @@ Converting date and time to timestamp and reverse converting
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 ## function toTimestamp
 
 input date format: YYYY-MM-DD, DD.MM.YYYY, hh:mm, YYYY-MM-DDThh:mm, YYYY-MM-DD hh:mm, DD.MM.YYYYThh:mm, DD.MM.YYYY hh:mm
 output result timestamp with timezone
+
+## toDateString
+
+input timestamp
+output date format DD.MM.YYYY or null
+
+## toISODateString
+
+input timestamp
+output date format YYYY-MM-DD or null
+
+## toDateLongString
+
+input timestamp
+output date format DD month YYYY or null
+
+## toISOString
+
+input timestamp, withSeconds = true
+withSeconds = true (default): output date format YYYY-MM-DDThh:mm:ss or null
+withSeconds = false: output date format YYYY-MM-DDThh:mm or null
+
+## toDateTimeString
+
+input timestamp, withSeconds = true
+withSeconds = true (default): output date format DD.MM.YYYY hh:mm:ss or null
+withSeconds = false: output date format DD.MM.YYYY hh:mm or null
+
+## toTimeString
+
+input timestamp, withSeconds = true
+withSeconds = true (default): output date format hh:mm:ss or null
+withSeconds = false: output date format hh:mm or null