Parse an IST wall-clock date/time string to UTC seconds. Accepts YYYY-MM-DD, YYYY-MM-DD HH:MM[:SS], and the T-separated ISO variant. Parsing is explicit (never relies on the host machine's locale/timezone).
YYYY-MM-DD
YYYY-MM-DD HH:MM[:SS]
T
Parse an IST wall-clock date/time string to UTC seconds. Accepts
YYYY-MM-DD,YYYY-MM-DD HH:MM[:SS], and theT-separated ISO variant. Parsing is explicit (never relies on the host machine's locale/timezone).