fromisoformat() method Last Updated : 22 Aug, 2025 Comments Improve Suggest changes Like Article Like Report datetime.fromisoformat() is a built-in method in Python’s datetime module that converts a string formatted in ISO 8601 format (e.g., YYYY-MM-DD or YYYY-MM-DD HH:MM:SS) into a datetime.datetime object.Example: Python from datetime import datetime s = "2025-07-21 10:30:45" dt = datetime.fromisoformat(s) print(dt) Output2025-07-21 10:30:45 Explanation: The string is in a valid ISO format. fromisoformat() parses it directly into a datetime.datetime object.Syntaxdatetime.fromisoformat(date_string)Parameter: date_string is a string in ISO 8601 format (e.g., '2025-07-14' or '2025-07-14 12:30:00').Returns: A datetime.datetime object representing the given ISO-format string.ExamplesExample 1: Basic ISO date string Python from datetime import datetime s = "2025-07-14" dt = datetime.fromisoformat(s) print(dt) Output2025-07-14 00:00:00 Explanation: Since no time is specified, it defaults to midnight (00:00:00).Example 2: ISO date and time string Python from datetime import datetime s = "2025-07-14 15:45:30" dt = datetime.fromisoformat(s) print(dt) Output2025-07-14 15:45:30 Explanation: The date and time are parsed accurately from the ISO string.Example 3: ISO string with microseconds Python from datetime import datetime s = "2025-07-14 15:45:30.123456" dt = datetime.fromisoformat(s) print(dt) Output2025-07-14 15:45:30.123456 Explanation: The microseconds part is also preserved while converting the string into a datetime object.Example 4: ISO string with timezone offset Python from datetime import datetime s = "2025-07-14T10:30:00+05:30" dt = datetime.fromisoformat(s) print(dt) Output2025-07-14 10:30:00+05:30 Explanation: The function parses ISO strings with timezone offsets correctly, returning an aware datetime object.Example 5: Invalid Format Raises Error Python from datetime import datetime s = "14-07-2025" dt = datetime.fromisoformat(s) OutputHangup (SIGHUP)Traceback (most recent call last): File "/home/guest/sandbox/Solution.py", line 3, in <module> dt = datetime.fromisoformat(s)ValueError: Invalid isoformat string: '14-07-2025'Explanation: fromisoformat() only accepts ISO 8601-compliant strings. 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